Harley Davidson Battery Size Chart needs a Harley rider. The battery starts the engine. It also powers lights and other parts. Picking the right battery is more than just size. You need to know about its power, type, and if it fits your bike’s model and year.
This guide helps Harley owners choose and care for their battery. It covers real Harley batteries and other good brands. It also explains what battery numbers mean. Plus, it shows how to charge and care for your battery. Following these tips will help your Harley run well for a long time.
You can also read : My Proven Harley Havidson Tire Tressure Chart: Unlock Excited Rides!
Battery Basics for Your Harley
To pick a battery, you need to know some basic terms. These terms help you understand how batteries work.
Key Terms
- Amp-Hour (Ah): This number shows how much power a battery can hold. For example, a 20Ah battery can give 1 amp for 20 hours. More Ah means more power for things like radios or heated gear. It also means the battery lasts longer between charges.
- Cold Cranking Amps (CCA): CCA tells you how well a battery starts your engine in cold weather. It’s how many amps a 12-volt battery gives at 0°F (-18°C) for 30 seconds. It must keep at least 7.2 volts. For Harleys, especially in cold places, a high CCA is key for quick starts.
- Voltage: Most new Harleys use 12-volt batteries. Some very old bikes might use 6-volt systems. Always check your Harley’s manual for the right voltage.
Battery Types
Battery types have changed over time. Each type has its own good points.
- Lead-Acid (Regular/Flooded): These are old-style motorcycle batteries. They have caps you can open to check and add fluid. They need regular care. Newer bikes use other types more often.
- Absorbed Glass Mat (AGM): AGM batteries are better. They are sealed and need no care. The fluid is held in glass mats inside. This makes them spill-proof and good for bumpy rides. AGM batteries start well in cold weather. They are often better than old Gel batteries for starting engines.
- Lithium Iron Phosphate (LiFePO4): These are called “Lithium” batteries. They are the newest type. They offer many good things:
- Much Lighter: Lithium batteries can be 70% lighter than lead-acid ones. For example, Harley’s own Lithium batteries save a lot of weight. They save 17.6 lbs on Touring bikes. They save 12.2 lbs on Softail, Dyna, and V-Rod bikes. They save 8.8 lbs on Sportster and Street models. Less weight helps your bike handle better.
- More Starting Power: LiFePO4 batteries give 3 to 4 times more starting power than lead-acid. They give more than 2 times that of a standard AGM battery. This means your big V-twin engine starts faster and easier.
- Fast Charging: Lithium batteries charge much faster. They can get full in about 3 hours. Standard batteries take about 12 hours.
- Holds Charge Longer: They lose very little charge over time. This is about 3-5% per month. If you unhook them from your bike, a Harley lithium battery can last up to 12 months without care. This is good for storage.
- More Usable Power: Lithium LiFe batteries use 85% of their power. AGM batteries only use about 10% for accessories. This means more available power for your bike’s lights and other parts.
- Smart System Inside (BMS): Many lithium batteries, like Harley’s, have a smart system. It protects the battery from too much or too little charge. It also guards against too much heat. This helps the battery last longer.
- Gel Batteries: Gel batteries are sealed. But they are not like AGM. They are not as good for starting engines. They are also easily hurt by too much charging. Their max charge is 14.4V. Most new Harley chargers work at higher voltages. So, Gel batteries are not often used for starting Harleys today.
Harley-Davidson sells its own Lithium LiFe batteries. They call them “genuine” parts. They fit right in, like old batteries. They are the “same physical size”. They even come with a “caddy” and “no foam blocks needed”. This shows Harley wants to make it easy to upgrade. They are pushing lithium batteries. This means future Harleys will likely use lithium. Harley is helping owners of older bikes upgrade too. Lithium is becoming the new standard for Harley batteries. Harley is looking ahead in battery tech. They are moving past old lead-acid types. They are using better, newer battery types.
The first question was about “Harley Davidson Battery Size Chart.” This sounds like it’s just about how big the battery is. But the info shows it’s also about power (Ah and CCA) and battery type. Lithium batteries give more power from a smaller, lighter size. For a Harley owner, “battery size” means more than just physical fit. It means how it fits. It means how much power it has (Ah for long use, CCA for starting). It also means what type of battery it is. A good guide must cover all these parts of “size.” This helps you pick the best battery. Old “size charts” that only showed physical size are not enough now.
The V-Rod is often called out as different for Harley battery fit. One source says V-Rods use batteries like those in Japanese bikes. Another says some V-Rod models need special parts. Fitment guides list V-Rod models separately. This means V-Rods are built differently. V-Rod owners must check for their specific model. This helps avoid problems with fit or power. It means V-Rod owners cannot just use general Harley battery advice.
You can also read : The Ultimate Harley Air Shock Pressure Chart Guide 2025
Real Harley-Davidson Battery Choices
Harley-Davidson now offers its own Lithium LiFe batteries. They are made to replace old batteries in many Harley models.
Harley-Davidson Lithium LiFe Batteries: Details and Benefits
Harley-Davidson has three main Lithium LiFe battery models. These are the 4Ah (Part No. LTM14BL / 66000171), 6Ah (Part No. LTM21L / 66000174), and 8Ah (Part No. LTM30L / 66000175). A big plus for these batteries is their size. All three are 146mm tall, 150mm wide, and 87mm front to back. This same size makes it easy to upgrade many Harley models. They fit into the old battery spots.
These lithium batteries give more Cold Cranking Amps (CCA) than old lead-acid ones:
- The 4Ah (LTM14BL) gives 200 CCA. It replaces the Lead Acid HD-65958-04.
- The 6Ah (LTM21L) gives 270 CCA. It replaces the Lead Acid HD-65989-97.
- The 8Ah (LTM30L) gives 385 CCA. It replaces the Lead Acid HD-66010-97.
These batteries also save a lot of weight. This helps your bike perform better. For example, the 4Ah lithium battery weighs 1.0kg. This saves 4.0kg compared to its old lead-acid type. The 6Ah battery saves 5.3kg. The 8Ah battery saves a big 7.7kg. Harley-Davidson lithium batteries last more than twice as long as AGM batteries. They also give much higher cranking amps. If you unhook them right, they need no care for up to 12 months. For Touring and Softail models, a special holder is included. This makes them fit perfectly. No foam blocks are needed.
Official Harley-Davidson Lead-Acid Batteries
Harley-Davidson still uses older lead-acid batteries too. Their three main lead-acid battery numbers are 65958-04, 65989-97, and 66010-97. Harley often adds a letter (like A, B, C, D) to the end of the number. For example, 65989-97A might become 65989-97C. This means small updates to the battery over time. The 66010-82B is a real Harley AGM battery. It fits 1980-1996 Touring models.
Standard Sizes of Harley-Davidson Batteries
Harley-Davidson Lithium LiFe batteries are all the same size. They are 146mm tall, 150mm wide, and 87mm front to back. This makes them easy to swap out. Harley battery boxes are usually big. They were made for larger, heavier lead-acid batteries. This extra space means the smaller lithium batteries fit easily. You might use foam padding to make them snug.
Genuine Harley-Davidson Lithium and Lead-Acid Battery Comparison
| H-D Lithium Battery / Our Part No. | Harley Genuine Part Number (Lithium) | Lead Acid Equivalent Part Number | Lead Acid CCA | Lithium CCA (Harley) | Weight (Lithium) | Weight Saving (Lithium) | Physical Dimensions (L x W x H) |
| Harley-Davidson® Lithium LiFe 4Ah Battery / LTM14BL | 66000171 | HD-65958-04A | 200 | 160 / 240 | 1.0 kg | 4.0 kg | 150mm x 87mm x 146mm |
| Harley-Davidson® Lithium LiFe 6Ah Battery / LTM21L | 66000174 | HD65989-97C | 270 | 240 / 360 | 1.5 kg | 5.3 kg | 150mm x 87mm x 146mm |
| Harley-Davidson® Lithium LiFe 8Ah Battery / LTM30L | 66000175 | HD66010-97D | 385 | 320 / 480 | 1.8 kg | 7.7 kg | 150mm x 87mm |
Harley-Davidson’s three real lithium batteries are “all the same physical size”. They fit “a majority of the bikes Harley have made in the past two decades”. They fit “pretty much any model (except models like the V-Rod)”. This same size is a smart choice. It makes it easier for owners. Most Harley owners can now pick a battery based on how much power they want (4Ah, 6Ah, or 8Ah). They don’t have to worry much about physical fit. This makes choosing easier. It also helps people upgrade to lithium. But the V-Rod is still different. This means V-Rod owners still need to check fit carefully.
Adding letters (A, B, C, D) to battery numbers (like 65989-97A to 65989-97C) means Harley-Davidson keeps making small updates. For you, this means a newer battery (like a -97D) might be a bit better. It could have improved parts or be made better. This is important for getting the best fit and performance. It shows Harley keeps making its products better.
You can also read : Harley Davidson Handlebar Size Chart: A Practical Guide 2025
Other Battery Brands and Guides
Besides Harley’s own batteries, many other brands sell good options. They might offer different features or prices.
Yuasa Batteries: Fit for Your Model and Year
Yuasa is a well-known battery maker. They give very detailed info for Harley-Davidson bikes. Yuasa’s guides list batteries by Harley engine size (like 1870 CC, 1250 CC). They also list by model series (like FLH, FXD, XL) and exact year. This detail is very helpful. It helps owners find the right replacement. They offer different battery types. These include GYZ Series AGM, standard High Performance AGM, general AGM, and old Yumicron / Conventional batteries.
For example, for 2018-2019 FL (Softail) models with 1870 CC engines, Yuasa suggests GYZ20HL, YTX20HL-BS, or YTX20L-BS. These batteries are usually 6 7/8 x 3 7/16 x 6 1/8 inches. They have a 20 Ah capacity and 320 CCA. Yuasa also notes special needs for V-Rod models. They might need YTX14 FA or YTX14H FA batteries. They also warn that some YTX20 series batteries might need changes to the hold-down.
Yuasa Battery Fitment for Harley-Davidson Models (by CC, Model, Year)
| Engine CC | Harley Model Series | Year Range | Recommended Yuasa Battery (Part Number) | Battery Type | Dimensions (L x W x H) (inches) | Capacity (10-HR Ah) | CCA @ 0°F |
| 1870 CC | FX, FL (Softail) | 2018-2019 | GYZ20HL, YTX20HL-BS, YTX20L-BS | GYZ Series AGM, High Performance AGM, AGM | 6 7/8 x 3 7/16 x 6 1/8 | 20 | 320 |
| 1803 CC | CVO FLH (Touring) | 2007-2016 | GYZ32HL, YIX30L-BS, YB30L-B | GYZ Series AGM, High Performance AGM, Yumicron | 6 9/16 x 5 x 6 7/8 | 32 (GYZ32HL), 30 (others) | 500 (GYZ32HL), 400 (others) |
| 1750 CC | FLH, FLT (Touring), FLR | 2017-2019 | GYZ32HL, YIX30L-BS, YB30L-B | GYZ Series AGM, High Performance AGM, Yumicron | 6 9/16 x 5 x 6 7/8 | 32 (GYZ32HL), 30 (others) | 500 (GYZ32HL), 400 (others) |
| 1690 CC | FXD (Dyna) | 2012-2017 | GYZ20HL, YTX20HL-BS, YTX20L-BS | GYZ Series AGM, High Performance AGM, AGM | 6 7/8 x 3 7/16 x 6 1/8 | 20 | 320 |
| 1584 CC | FL, FLH (Touring) | 2007-2010 | GYZ32HL, YIX30L-BS, YB30L-B | GYZ Series AGM, High Performance AGM, Yumicron | 6 9/16 x 5 x 6 7/8 | 32 (GYZ32HL), 30 (others) | 500 (GYZ32HL), 400 (others) |
| 1450 CC | FXST, FLST (Softail) | 2000-2006 | GYZ20HL, YTX20HL-BS, YTX20L-BS | GYZ Series AGM, High Performance AGM, AGM | 6 7/8 x 3 7/16 x 6 1/8 | 20 | 320 |
| 1340 CC | FL, FLH (Touring) | 1985-1996 | YTX24HL-BS, Y50-N18L-A-CX | AGM, Yumicron / Conventional | 8 1/8 x 3 7/16 x 6 3/8 (AGM), 8 1/8 x 3 9/16 x 6 3/8 (Yumicron) | 21 (AGM), 20 (Yumicron) | 350 (AGM) |
| 1250 CC | VRSC V-Rod | 2007-2017 | GYZ20HL, YTX20HLFA, YTX20LFA | GYZ Series AGM, High Performance AGM, AGM | 6 7/8 x 3 7/16 x 6 1/8 | 20 | 320 |
| 1200 CC | XL, XLH (Sportster) | 2004-2019 | GYZ16HL, YTX14L-BS | GYZ Series AGM, AGM | 6 x 3 7/16 x 5 3/4 | 16 (GYZ16HL), 12 (YTX14L-BS) | 240 (GYZ16HL), 200 (YTX14L-BS) |
| 1130 CC | VRSC V-Rod | 2002-2006 | GYZ16H, YTX14HFA | GYZ Series AGM, High Performance AGM | 6 x 3 7/16 x 5 3/4 | 16 (GYZ16H), 12 (YTX14HFA) | 240 (GYZ16H, YTX14HFA) |
| 883 CC | XL, XLH (Sportster) | 2004-2019 | GYZ16HL, YTX14L-BS | GYZ Series AGM, AGM | 6 x 3 7/16 x 5 3/4 | 16 (GYZ16HL), 12 (YTX14L-BS) | 240 (GYZ16HL), 200 (YTX14L-BS) |
| 750 CC | Street | 2014-2019 | GYZ16HL, YTX14L-BS | GYZ Series AGM, AGM | 6 x 3 7/16 x 5 3/4 | 16 (GYZ16HL), 12 (YTX14L-BS) | 240 (GYZ16HL), 200 (YTX14L-BS) |
| 500 CC | Street | 2014-2019 | GYZ16HL, YTX14L-BS | GYZ Series AGM, AGM | 6 x 3 7/16 x 5 3/4 | 16 (GYZ16HL), 12 (YTX14L-BS) | 240 (GYZ16HL), 200 (YTX14 |
Interstate, Odyssey, Antigravity, and Shorai: Other Good Choices
Many other good brands sell batteries for Harley-Davidson motorcycles. They often have special features.
- Interstate Batteries: Interstate offers many Factory-Activated AGM Powersports Batteries. They list part number, voltage, Ah, CCA, weight, and size. For example, the FAGYZ32HL is a 12V, 32Ah battery with 500 CCA. It measures 4 15/16 x 6 9/16 x 6 7/8 inches. The FAYIX30L is 12V, 30Ah, and 385 CCA. Its size is 5 x 6 9/16 x 6 7/8 inches. To find the right fit for your Harley, you usually need to use their online tool.
- Odyssey Batteries: Odyssey is known for strong Extreme Series AGM batteries. They offer high starting power and last a long time. Examples are the PC950 (12V, 32Ah, 400 CCA, 250x97x155mm) and the smaller PC310 (12V, 7Ah, 100 CCA, 137x86x99mm). Like Interstate, you usually need their online tool to find the right Harley fit.
- Antigravity Batteries: This company makes light, powerful lithium-ion batteries. For example, the Antigravity ATX-20-HD is a 12.8V lithium-ion battery. It has a strong 780 CA (cranking amps). It is 30 PbEq Ah (15 actual Ah). It weighs only 5.18 lbs. Its size is 6.9 x 3.4 x 5.12 inches. This model fits the 2025 Harley Davidson 1250cc Pan America Series. Antigravity says their batteries are “70% weight reduction over lead/acid” and give “Extreme Power”.
- Shorai Batteries: Shorai also makes LiFePO4 batteries. They are light and start engines well. Shorai batteries need a special charging system. It must give 13.1V or more when the bike is idling. It must not go over 15.2V at full power. They have different “case sizes.” For example, Case size #3 is 166mm long, 86mm wide, and 155mm high. It has different Ah and CCA ratings. The LFM36L3-BS12 is a 12V, 12.0Ah battery with 540 CCA. It weighs 4.55 lbs. Its size is 6.55″ x 3.39″ x 6.10″. The papers don’t usually list direct Harley model fitment. You often need to match by size or old battery numbers.
How to Size a Motorcycle Battery
If you don’t have your bike’s exact year, make, and model, you can still find a battery. This is common for custom bikes or old ones. The easiest way is to use the old battery’s part number. Or, use its exact size. If you don’t have an old battery, measure the battery space. Then pick a battery that fits.
General battery sizes can help:
- Small Size: About 3 to 10 AH.
- Medium Size: About 10 to 14 AH.
- Large Size: About 18 to 30 AH.
It is very important to check the battery’s polarity. This is where the positive and negative posts are. It must match your bike’s wiring. If it doesn’t, it can harm your bike.
General Motorcycle Battery Size Chart (Small, Medium, Large Case)
| Case Size Category | Approximate AH Range | Common Part# Examples | Approximate Dimensions (L x W x H) (inches) | CCA (examples) | Polarity |
| Small Case Size | 3-10 AH | YT3L, YTX3L-BS, YTX5L-BS, YTZ7S | Varies (e.g., 3.88×2.13×4.38 to 4.5×2.82×5.19) | 35-130 | Varies |
| Medium Case Size | 10-14 AH | YB10L-A2, YTZ10S, YTX12, YTX14 | Varies (e.g., 5.32×3.57×5.75 to 6.0×3.44×3.69) | 160-240 | Varies |
| Large Case Size | 18-30 AH | YTX20, YTX30, YIX30L | Varies (e.g., 6.89×3.5×5.12 to 6.5×5.0x6.89) | 680-880 | Varies |
Key Specifications of Select Aftermarket Harley-Davidson Batteries
| Brand | Part Number | Battery Type | Voltage | Capacity (Ah) | CCA | Physical Dimensions (L x W x H) | Weight |
| Interstate | FAGYZ32HL | AGM | 12V | 32 | 500 | 4 15/16 x 6 9/16 x 6 7/8 in | 24.7 lb |
| Interstate | FAYIX30L | AGM | 12V | 30 | 385 | 5 x 6 9/16 x 6 7/8 in | 22.0 lb |
| Odyssey | PC950 | AGM | 12V | 32 (C10) | 400 | 250 x 97 x 155 mm | N/A |
| Odyssey | PC310 | AGM | 12V | 7 (C10) | 100 | 137 x 86 x 99 mm | N/A |
| Antigravity | ATX-20-HD | LiFePO4 | 12.8V | 30 (PbEq) / 15 (actual) | 780 | 6.9 x 3.4 x 5.12 in | 5.18 lb |
| Shorai | LFM36L3-BS12 | LiFePO4 | 12V | 12.0 | 540 | 6.55 x 3.39 x 6.10 in | 4.55 lb |
Yuasa gives very detailed fitment data by model year. This makes it easy to find a direct replacement. Other brands like Interstate, Odyssey, Antigravity, and Shorai often list products by general specs. These include Ah, CCA, and size. Or, you need to use their online tools to find a fit. Lithium makers like Shorai and Antigravity focus on high CCA and low weight. This shows different parts of the battery market. Yuasa is for those who want an easy, proven replacement. Other brands, especially lithium ones, are for people who want better performance. They might have custom bikes. They are willing to check sizes or use online tools. This means “fitment” is not just one thing. It depends on what you need. Is it easy replacement or best performance?
Shorai and Antigravity use “Ah (PbEq)” or “AH (PbEq).” This means “Lead-Acid Equivalent.” They also show “actual Ah.” This is needed because lithium batteries use more of their power. For example, Harley Lithium uses 85%. Old lead-acid batteries might only use 10% for starting. The “PbEq” number helps people who know lead-acid batteries. It helps them understand how much power a lithium battery really gives. This stops confusion about lower “actual” Ah numbers. It means lithium battery makers are helping people compare new and old battery types. It also means you cannot just compare lithium and lead-acid batteries by their Ah number alone. This can lead to bad choices.
You can also read : Harley Davidson Oil Capacity Chart: What You Need to Know 2025
Making Sure the Battery Fits
Even if a battery has the right power (voltage, Ah, CCA), it must fit. It needs to go into your bike’s battery space. If it doesn’t fit right, it can get damaged. It could cause electrical problems. Or it might not stay in place. This can be dangerous.
Harley-Davidson Battery Sizes
Harley-Davidson Lithium LiFe batteries are all the same size. They are 146mm tall, 150mm wide, and 87mm front to back. This makes them easy to upgrade. Harley battery boxes are usually big. They were made for larger, heavier lead-acid batteries. This extra space means the smaller lithium batteries fit easily. You might use foam padding to make them snug.
Other Battery Tray Sizes
For custom bikes or older models, knowing the battery tray size is key. An aftermarket “Under Fender Battery Box” for 1999-Current Touring Models can hold a battery up to 7.25″ long x 7″ wide x 6″ high. Older models have different tray sizes:
- For FLH models from 1974-1979: 205 x 135 mm (width x depth).
- For FX models with electric start from 1973-1984: 175 x 100 mm (width x depth).
- For FX models with kickstart from 1971-1978: 140 x 78 mm (width x depth).
Check Polarity
Always check the polarity. This is the positive and negative terminal positions. Make sure they match your old battery or your bike’s wires. Wrong polarity can cause serious damage.
Common Harley-Davidson Battery Tray Dimensions (OEM & Aftermarket)
| Model/Year Range | Battery Type/Tray Description | Length (mm/inches) | Width (mm/inches) | Height/Depth (mm/inches) |
| All Genuine H-D Lithium LiFe | Standard Lithium Battery | 150 mm / 5.9 in | 87 mm / 3.4 in | 146 mm / 5.75 in |
| 99-Current Touring with Aftermarket Under Fender Box | Aftermarket Battery Box (max battery size) | 7.25 in | 7 in | 6 in |
| FLH 1974-1979 | OEM Replacement Battery Carrier Tray | 205 mm / 8.07 in | 135 mm / 5.31 in | N/A (depth) |
| FX with electric starter 1973-1984 | OEM Replacement Battery Carrier Tray | 175 mm / 6.89 in | 100 mm / 3.94 in | N/A (depth) |
| FX with kickstart 1971-1978 | OEM Replacement Battery Carrier Tray | 140 mm / 5.51 in | 78 mm / 3.07 in | N/A (depth) |
Harley-Davidson made its lithium batteries a standard size. They also made battery boxes big. This makes it easy to upgrade OEM batteries. But, old bikes and custom builds still need exact measurements for battery trays. This means picking a battery for a Harley is two-sided. For newer bikes or OEM upgrades, power (Ah, CCA) is key. The size usually fits. For older bikes, custom builds, or special trays, physical size is still very important. So, a good guide must cover both. It needs to show the right way to size a battery for your specific bike.
Charging and Caring for Your Harley Battery
Proper charging and care make your battery last longer. They also keep your bike running well and safe. Follow these tips for all batteries. Also, follow tips for your specific battery type.
General Charging Rules and Safety
- Good Airflow: Always charge batteries in a well-aired place. This lets out explosive hydrogen gas safely.
- No Sparks or Flames: Keep all open flames, sparks, and smoking away from batteries. Do this when charging and handling them.
- Connect Right: Always unplug or turn OFF the charger first. Do this before you hook up or unhook the cables. Hook up the positive (+) cable first. Then hook up the negative (-) cable to the battery or bike frame. Unhook them in the reverse order.
- Match Voltage: Make sure the charger’s voltage matches the battery’s voltage. For example, use a 12V charger for a 12V battery. Wrong voltage can harm both.
- Match Amps: Pick a charger that gives about 10% of the battery’s Amp-hour (Ah) rating. For example, use a 2-amp charger for a 20Ah battery. Lower amp settings (1-2 amps for bike batteries) are safer. They help the battery last longer. High amp chargers can make the battery too hot and damage it.
- Check Heat: Watch the battery’s heat while charging. If it gets too warm, or over 110°F (43°C), unplug the charger. Let it cool down.
- Don’t Overcharge: Charging too much often harms batteries. Too much voltage makes too much heat. This can bend plates, cause shorts, or dry out the battery.
- Don’t Let it Die: For lead-acid batteries, a full discharge can freeze the fluid. This can crack the battery case. For lithium batteries, don’t let the voltage drop below 8V. This can be dangerous.
- Bike Check: Before putting in a new battery, have a pro check your bike’s electrical system. Make sure it works right. This stops it from overcharging the new battery.
How to Charge AGM Batteries
Newer Harley-Davidson bikes often have sealed AGM batteries. They need special charging. AGM batteries need a smart charger. It must watch the battery and keep the charge under 14.6 volts. This stops overcharging and drying out the cells. Regular chargers (like old “trickle chargers”) can badly harm AGM batteries. They might even void the warranty.
AGM chargers usually charge in three steps for best battery health:
- Bulk Stage: First, the charger gives full power. It brings the battery to about 80% full. The voltage slowly goes up to about 14.7V.
- Absorption Stage: As the battery gets full, the power goes down. A high, steady voltage (14.4V to 14.7V) is kept. This lasts until the battery is 100% charged.
- Float Stage: Once full, the charger lowers its voltage. It keeps it at a low level (13.6-13.8V). This “float” mode stops overcharging. It keeps the battery full. Charging a new AGM battery can take 2-6 hours with a 10A charger. A very low battery might take up to 14 hours.
How to Charge Lithium-Ion Batteries
Lithium-ion batteries work better. But they need very specific charging. It’s different from lead-acid batteries. You must only use a Lithium-Ion (Li-ion) specific battery charger.
Never use a lead-acid charger that tries to “desulfate”. This will ruin the lithium battery. The charge voltage for Li-ion batteries must be between 14-15V. It must
never go over 15V. This can cause overcharging and gas release. Do not try to charge a lithium battery if its voltage is below 8V. This can be dangerous.
Lithium batteries do not like “trickle-charge” like lead-acid ones. Instead, charge them now and then. For example, a 30-minute charge every 2 months. For long storage, keep them about 70% charged. Recharge them every 6 months if the voltage drops below 12.4V.
Here are typical charge times for Harley-Davidson’s LiFe batteries. This is with a 0.80 Amp charger:
- 4Ah (Part No. 66000171): About 3.25 hours from 35% charge. Up to 4.25 hours from 15%.
- 6Ah (Part No. 66000174): About 4.9 hours from 35% charge. Up to 6.4 hours from 15%.
- 8Ah (Part No. 66000175): About 6.5 hours from 35% charge. Up to 8.5 hours from 15%.
Cold Weather: Lithium batteries might not start as well in cold weather (below 0°C / 32°F). To help, you can “warm up” the battery. Hook up a lithium charger for 30 seconds. Or turn on the bike’s lights for 1-2 minutes. Then try to start the engine. For older bikes, make sure the bike’s charging system gives 14-15V. Bikes made before the mid-1990s might need a new voltage regulator. This stops overcharge damage to a lithium battery.
Harley-Davidson Lithium-Ion Battery Charging Times (using 0.80 Amp Charger)
| Amp Hour Part Number | Voltage (V) | % of Charge | Typical Charging Times (Hours) |
| 4 Ah 66000171 / 66000228 | 13.4 | 100% | N/A |
| 4 Ah 66000171 / 66000228 | 13.3 | 90% | 0.5 |
| 4 Ah 66000171 / 66000228 | 13.2 | 75% | 1.25 |
| 4 Ah 66000171 / 66000228 | 13.1 | 35% (Recommended recharge voltage) | 3.25 |
| 4 Ah 66000171 / 66000228 | 13.0 | 25% | 3.75 |
| 4 Ah 66000171 / 66000228 | 12.9 | 20% | 4 |
| 4 Ah 66000171 / 66000228 | 12.8 | 15% | 4.25 |
| 4 Ah 66000171 / 66000228 | <12.8 | 5% (Risk of deep discharge) | Test voltage before charging |
| 6 Ah 66000174 / 66000229 | 13.4 | 100% | N/A |
| 6 Ah 66000174 / 66000229 | 13.3 | 90% | 0.75 |
| 6 Ah 66000174 / 66000229 | 13.2 | 75% | 1.9 |
| 6 Ah 66000174 / 66000229 | 13.1 | 35% (Recommended recharge voltage) | 4.9 |
| 6 Ah 66000174 / 66000229 | 13.0 | 25% | 5.6 |
| 6 Ah 66000174 / 66000229 | 12.9 | 20% | 6 |
| 6 Ah 66000174 / 66000229 | 12.8 | 15% | 6.4 |
| 6 Ah 66000174 / 66000229 | <12.8 | 5% (Risk of deep discharge) | Test voltage before charging |
| 8 Ah 66000175 / 66000230 | 13.4 | 100% | N/A |
| 8 Ah 66000175 / 66000230 | 13.3 | 90% | 1 |
| 8 Ah 66000175 / 66000230 | 13.2 | 75% | 2.5 |
| 8 Ah 66000175 / 66000230 | 13.1 | 35% (Recommended recharge voltage) | 6.5 |
| 8 Ah 66000175 / 66000230 | 13.0 | 25% | 7.5 |
| 8 Ah 66000175 / 66000230 | 12.9 | 20% | 8 |
| 8 Ah 66000175 / 66000230 | 12.8 | 15% | 8.5 |
| 8 Ah 66000175 / 66000230 | <12.8 | 5% (Risk of deep discharge) | Test voltage before chargin |
Many sources warn against using the wrong chargers. This is true for AGM and Lithium-Ion batteries. Harley-Davidson says that not charging regularly or using wrong chargers can void the warranty for AGM batteries. For lithium, the warnings are even stronger. Using lead-acid chargers with “desulfation” can cause “irreversible damage”. This means a big risk for Harley owners. Using the wrong charger is not just bad. It can break your battery for good. It can also make your warranty useless. This means caring for your battery is very important. You need the right charger for your battery type.
A helpful tip for lithium batteries is this: “Lithium batteries start less well in cold weather (below 0°C). If the engine won’t start, you can warm up the battery. 1. Hook up a lithium charger for 30 seconds. 2. Turn on the lights for 1-2 minutes before starting”. This is key for lithium battery users in cold places. Lithium batteries can act poorly in the cold. They might even stop working until they warm up. This “warm-up” trick is special for lithium. It shows a different way to use them. It helps you start your bike in cold weather.
It says that “Constant current battery chargers (like trickle chargers) can damage AGM batteries”. For lithium batteries, it says “Lithium batteries don’t support a trickle-charge”. Instead, new chargers for AGM batteries “constantly monitor”. Or they use a “float stage” to keep the charge. Lithium batteries need “periodical charges”. Old “trickle chargers” were fine for old lead-acid batteries. But now, they can harm new AGM and lithium batteries. This is a big change in battery care. Owners need to know that new chargers are “smart.” They change their power to stop overcharging. This means you should use modern, smart chargers for your Harley battery.
Good Battery Chargers
Buying the right charger is as important as picking the right battery. Harley-Davidson suggests its own smart chargers. They often have easy quick-disconnect cables. Other good chargers include NOCO GENIUS2 (for wet-cell, gel, AGM, and Li-ion, 2A charge rate), CTEK CS FREE, Oxford Oximiser 900, and OptiMate Solar. Interstate Batteries also suggests their Guardian 1. It’s a 1.2-amp smart charger for AGM batteries. When you pick a charger, look for ones that charge in steps (Bulk, Absorption, Float). Look for ones that adjust for heat. Also, look for safety features. These include protection from wrong connections and overcharging.
Tips for Long-Term Battery Care
If you don’t ride your Harley often, charge the battery about once a month. For AGM batteries, Harley-Davidson says to hook up a smart charger if you won’t ride for more than two weeks. It’s best to keep the charger on whenever the bike is not used. For Lithium batteries, store them about 70% charged. If stored, check the voltage often. Recharge every 6 months if it drops below 12.4V. Remember, lithium batteries don’t need constant trickle charging. Clean battery posts and cables often. Remove any rust. Put a thin layer of electrical grease on them. This helps them connect well. For old (flooded) batteries, make sure the vent tube is in place. It stops gas buildup. It also sends any overflow away from metal parts.
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FAQs About Harley Davidson Battery Size Chart
What are the main benefits of Harley-Davidson Lithium LiFe batteries?
Harley-Davidson Lithium LiFe batteries are much lighter, offer more cranking power for quick starts, and charge faster. They also last longer and have a smart system for protection.
How do I find the correct size battery for my Harley-Davidson?
To find the right Harley-Davidson battery size, check your old battery’s part number or its exact physical dimensions. You can also measure your battery compartment. Always match the polarity.
What do Amp-Hour (Ah) and Cold Cranking Amps (CCA) mean for Harley-Davidson batteries?
Amp-Hour (Ah) shows how much power a Harley-Davidson battery holds. Cold Cranking Amps (CCA) tells you how well it starts your engine in cold weather. Higher numbers are usually better.
Can I use aftermarket batteries like Yuasa or Interstate for my Harley-Davidson?
Yes, many aftermarket brands like Yuasa and Interstate offer compatible Harley-Davidson batteries. Yuasa provides detailed fitment guides by model and year. Interstate also has various options.
What kind of charger should I use for my Harley-Davidson AGM battery?
For your Harley-Davidson AGM battery, use an automatic, constant monitoring charger. It must keep the charge under 14.6 volts. Avoid old “trickle chargers” as they can cause damage.
What are the special charging rules for Harley-Davidson Lithium-Ion batteries?
Only use a Lithium-Ion specific charger for your Harley-Davidson. The charge voltage must be 14-15V and never over 15V. Do not use lead-acid chargers with “desulfation” programs.
Are Gel batteries a good choice for Harley-Davidson motorcycles?
Gel batteries are generally not the best choice for Harley-Davidson starting needs. Most bike charging systems are made for AGM or Lithium batteries, which can use higher voltages.
Do Harley-Davidson’s genuine Lithium LiFe batteries fit all Harley models?
Harley-Davidson’s genuine Lithium LiFe batteries fit most models. They are all the same physical size. However, models like the V-Rod often need different battery types.
Conclusion
Picking the right battery for your Harley-Davidson is a big choice. It’s more than just size. You need to know about the battery type. This means Lead-Acid, AGM, or Lithium LiFePO4. You also need to understand its power numbers. These are Amp-hours for how long it lasts. Cold Cranking Amps are for starting power. And it must fit your bike’s battery space.
Harley-Davidson now offers standard Lithium LiFe batteries. This makes upgrading easy for many models. It gives benefits like less weight and more starting power. But, older bikes and custom builds still need careful checks. You must look at physical size and model year. This is especially true for bikes like the V-Rod. Other battery brands offer many choices. Some give detailed fitment info. Others focus on power. They might need you to match by size or power numbers. The “PbEq” (Lead-Acid Equivalent) rating for lithium batteries helps you compare them to older types.
Most important, how long your Harley battery lasts depends on how you charge and care for it. New AGM and Lithium-ion batteries need special chargers. These chargers use smart steps. Old “trickle chargers” can harm them. This can even void warranties. Know how lithium batteries work in cold weather. Always follow safety rules when charging.
In short, choose your Harley battery wisely. Think about what your bike needs. Think about how you want it to perform. And always use the right charging and care methods. This will keep your Harley running strong for many years.