7 Best Lithium Motorcycle Batteries for Harley Davidson in 2026

I’ve been riding Harleys for over a decade, and one upgrade that’s made the biggest difference in my bike’s performance is switching to a lithium battery. The weight savings alone transformed how my Street Glide handles, but the instant cranking power and longer lifespan sold me completely.

After testing numerous lithium batteries across my touring bikes and my buddy’s Sportster, I’ve learned which ones deliver on their promises and which fall short. The right lithium battery can shave 10-15 pounds off your Harley while providing more reliable starts than any lead-acid option I’ve used.

In this guide, I’m sharing the seven best lithium batteries I’ve personally tested or thoroughly researched for Harley Davidson motorcycles. Whether you’re running a Milwaukee-Eight engine or an older Twin Cam, I’ve got recommendations that’ll fit your specific needs.

1. Antigravity Batteries ATX20 — Best Overall Lithium Battery for Touring Harleys

The Antigravity ATX20 has been my go-to battery for the past three years on my 2019 Road Glide. This battery delivers 680 cold cranking amps, which is more than enough to fire up my Milwaukee-Eight 114 engine even in freezing temperatures.

I installed the ATX20 in January during a particularly brutal winter, and it cranked my bike over without hesitation at 15°F. The built-in battery management system constantly monitors cell health and protects against over-discharge, which has extended its lifespan considerably in my experience.

What really sets the Antigravity ATX20 apart is its restart function. I accidentally left my key on overnight once, and instead of being stranded with a dead battery, I simply pressed the restart button and had enough juice for two more start attempts. This feature has saved me twice now.

The weight difference is remarkable too. At just 2.5 pounds compared to the 17-pound stock battery, I immediately noticed improved handling and reduced front-end weight. This makes a real difference on long touring rides where every pound matters.

The ATX20 fits perfectly in the standard battery location on most 1997 and newer Big Twin models. I didn’t need any adapters or modifications. It dropped right into my Road Glide’s battery tray and the terminals lined up perfectly.

At around $400, it’s definitely an investment. But considering I’ve gotten three solid years out of mine with no degradation in performance, and I expect at least another five years, the cost-per-year makes sense compared to replacing lead-acid batteries every two to three years.

2. EarthX ETX36C — Best Value Lithium Battery for Most Harley Models

My riding buddy installed the EarthX ETX36C in his 2017 Street Bob, and I was so impressed with its performance that I recommended it to three other friends. This battery delivers 540 CCA, which is ideal for most Harley Davidson engines including Sportsters, Dynas, and Softails.

The ETX36C uses military-grade lithium iron phosphate cells that EarthX claims last over 2,000 charge cycles. Based on what I’ve seen over two years of my friend using it, this battery shows no signs of capacity loss even with frequent short trips that would kill a traditional battery.

I’ve watched this battery start a completely cold engine at 20°F without any cranking hesitation. The voltage stays remarkably stable during starting, which means your fuel injection and ignition systems get consistent power throughout the cranking cycle.

One feature I really appreciate about EarthX batteries is their built-in cell balancing system. Unlike some cheaper lithium options that can develop uneven cell charges over time, the ETX36C automatically balances its cells during charging to maintain optimal performance.

The ETX36C weighs just 3.8 pounds and fits the same footprint as most stock Harley batteries from 1997 onward. Installation is straightforward, and the terminals are positioned identically to OEM batteries, so your cables reach without modification.

At roughly $320, this battery hits the sweet spot between performance and price. It’s not the absolute cheapest lithium option, but you’re getting proven reliability and a three-year warranty that EarthX actually honors based on multiple riders I know who’ve made claims.

3. Shorai LFX36L3-BS12 — Best Lightweight Option for Performance Builds

I tested the Shorai LFX36L3-BS12 on my custom-built Dyna with a 103 cubic inch engine, and the weight savings blew me away. At just 2.65 pounds, this battery is one of the lightest options available while still delivering 540 CCA for reliable starting power.

Shorai pioneered lithium motorcycle batteries, and their experience shows in the LFX36L3’s build quality. The battery case feels solid, the terminals are robust brass construction, and the internal cell configuration is optimized specifically for motorcycle applications rather than repurposed from other industries.

What impressed me most during testing was the sustained cranking power. Even after multiple start attempts while tuning my fuel injection, the Shorai maintained strong voltage and never showed signs of weakness. Traditional batteries would have dropped off significantly after the third or fourth extended crank.

The LFX36L3 uses Shorai’s proprietary Extreme Rate Technology, which allows it to deliver high discharge rates without thermal buildup. I’ve never felt this battery get warm, even during extended cranking sessions or when running accessories with the engine off.

Installation requires some attention to detail because the battery is physically smaller than stock. Shorai includes foam spacers to fill gaps in the battery tray, and you’ll need to use them to prevent movement. Once properly secured with the spacers, it’s rock solid.

This battery typically runs around $280-300, making it competitively priced for the performance you’re getting. Shorai offers a one-year warranty, which is shorter than some competitors, but in my two years of use and tracking other riders’ experiences, failure rates seem very low.

4. Ballistic Performance EVO3 16-Cell — Best for Cold Weather Performance

Living in the Northeast, I need a battery that works reliably in cold weather, and the Ballistic Performance EVO3 16-cell has been my winter warrior. This battery maintains its cranking power down to temperatures where most other lithium batteries start struggling.

I installed the EVO3 specifically to test its cold weather claims, and I’ve started my Softail at temperatures as low as 5°F without any issues. The 16-cell configuration provides 480 CCA, and Ballistic’s proprietary cell chemistry performs better in cold conditions than standard lithium iron phosphate cells.

The EVO3 includes Ballistic’s integrated monitoring system that tracks individual cell voltages and overall battery health. I can check the battery status through LED indicators on the top of the case, which gives me peace of mind before heading out on cold mornings.

One feature I particularly value is the low-voltage cutoff protection. This battery automatically disconnects itself if voltage drops below safe levels, preventing the deep discharge damage that kills most lithium batteries prematurely. I’ve tested this by intentionally leaving accessories on, and it works exactly as advertised.

The EVO3 weighs 3.2 pounds and fits standard Harley battery boxes from 1997 forward. The terminal posts are slightly shorter than some batteries, so depending on your cable configuration, you might need to adjust or replace terminal bolts for optimal connection.

At around $350, the EVO3 sits in the mid-to-upper price range. The three-year warranty and demonstrated cold-weather performance justify the cost if you ride year-round or live in colder climates like I do.

5. Big Crank ETX36L — Best Budget Lithium Option Under $250

When my nephew needed a best motorcycle battery for Harley Davidson upgrade on a tight budget, I recommended the Big Crank ETX36L. This battery delivers surprising performance for its $230-250 price point, making lithium technology accessible without the premium price tag.

The ETX36L provides 460 CCA, which handles most Sportster, Dyna, and Softail engines without issue. My nephew installed it in his 2015 Iron 883, and it’s been starting reliably for over 18 months now, including through last winter’s cold snaps.

Big Crank uses quality lithium iron phosphate cells, and while they don’t include all the advanced monitoring features of premium batteries, the basic battery management system prevents overcharging and deep discharge. For riders who just want reliable starts without fancy features, this is perfectly adequate.

I’ve noticed the ETX36L performs best when paired with a quality lithium-compatible charger. My nephew uses a CTEK lithium charger, and keeping the battery properly maintained has clearly contributed to its longevity and consistent performance.

At 3.5 pounds, this battery still delivers significant weight savings compared to lead-acid options. The case construction feels solid, though not quite as refined as Antigravity or EarthX products. The terminals are standard size and positioning, so installation is straightforward.

The ETX36L comes with a two-year warranty, which is respectable for this price point. Based on real-world feedback from multiple riders I know using Big Crank batteries, the company stands behind their products when issues arise, though failures seem uncommon.

6. Full Throttle Battery FT500L — Best for Loaded Touring Bikes with High Accessory Loads

My Road King is loaded with accessories: heated grips, LED lighting, a premium sound system, and auxiliary power outlets. I needed a battery that could handle significant accessory draw, and the Full Throttle FT500L has exceeded my expectations.

This battery delivers an impressive 750 CCA, making it the highest-output option on my list. The extra capacity means my Milwaukee-Eight 107 cranks over instantly even when the battery has been powering accessories with the engine off. I’ve run my stereo for 30 minutes at bike nights without any starting concerns.

Full Throttle uses prismatic lithium cells arranged for optimal power delivery and thermal management. Even when I’m running heated gear, charging devices, and cranking the stereo, this battery maintains stable voltage without the dramatic drops I experienced with my old AGM battery.

The FT500L includes a sophisticated battery management system with overcharge protection, thermal monitoring, and cell balancing. I can monitor battery status through a companion smartphone app, which provides real-time voltage, temperature, and overall health metrics.

This battery is physically larger than some lithium options at 4.8 pounds, but that’s still a massive weight reduction from the 20-pound AGM it replaced. It fits standard touring bike battery compartments perfectly, and the terminal configuration matches OEM specifications exactly.

At approximately $450, the FT500L is the most expensive battery on my list. However, for riders with heavily accessorized touring bikes who need maximum capacity and reliability, it’s worth every penny. The five-year warranty demonstrates Full Throttle’s confidence in their product.

7. Motocross HJVT-2 — Best Compact Option for Sportster Models

Sportster riders face unique battery challenges due to limited space, and the Motocross HJVT-2 is specifically designed for tight installations. I helped my friend install this in his 2018 Forty-Eight, where the battery is tucked under the seat with minimal clearance.

The HJVT-2 delivers 420 CCA, which is appropriate for 883cc and 1200cc Sportster engines. Despite its compact size, this battery has consistently started my friend’s bike in temperatures ranging from 25°F to 95°F without any cranking issues.

Motocross designed this battery with specific attention to vibration resistance, which matters significantly on Sportsters with their rigid mounting systems. The internal cell pack is securely mounted to prevent damage from the constant vibration that plagues these bikes.

One feature I appreciate about the HJVT-2 is its low self-discharge rate. My friend stores his Sportster for three months during winter, and the battery maintains enough charge to start the bike in spring without needing a recharge. This is a huge advantage over lead-acid batteries that lose charge during storage.

At 2.8 pounds, this battery delivers substantial weight savings that Sportster riders really notice. The reduced weight up front improves handling, especially on the lighter Iron and Forty-Eight models where every pound matters.

The HJVT-2 typically sells for around $270-290, positioning it as a mid-range option. The three-year warranty and proven reliability in compact installations make it the smart choice specifically for Sportster applications where size constraints eliminate other options.

Installation and Maintenance Tips for Lithium Batteries

Installing a lithium battery in your Harley isn’t complicated, but there are several important considerations I’ve learned through experience. First, always disconnect the negative terminal first when removing your old battery, then disconnect the positive. When installing the lithium battery, reverse the process: connect positive first, then negative.

I strongly recommend using a lithium-compatible battery charger for maintenance. Standard lead-acid chargers apply charging profiles that can damage lithium batteries or significantly reduce their lifespan. I use a CTEK Lithium XS charger, which has kept all my batteries in perfect condition.

One mistake I see riders make is neglecting to use terminal protection spray. Even though lithium batteries don’t produce hydrogen gas like lead-acid batteries, the terminals still benefit from corrosion protection. I apply dielectric grease to every connection.

Understanding CCA Requirements for Your Harley

Matching cold cranking amps to your specific Harley Davidson engine is crucial for reliable performance. In my experience, Sportster 883 and 1200 engines need minimum 400 CCA, while Twin Cam 88, 96, and 103 engines work best with 480-540 CCA.

Milwaukee-Eight engines, especially the 114 and 117 versions, benefit from higher CCA ratings of 600-750 because of their larger displacement and higher compression ratios. I’ve found that having extra CCA capacity provides peace of mind and ensures strong starts in all conditions.

Don’t assume that more CCA is always better, though. Oversized batteries with excessive capacity can be heavier and more expensive than necessary. I match my battery choice to my engine’s actual requirements rather than buying the highest-CCA option available.

Lithium Battery Care and Longevity

Proper maintenance has extended the life of every lithium battery I’ve owned beyond manufacturer estimates. I keep my batteries on a maintenance charger whenever my bike sits for more than a week, which prevents the small parasitic draws from alarm systems and electronics from depleting capacity.

Temperature management matters more than most riders realize. I never charge a lithium battery when it’s below freezing, as charging cold lithium cells can cause permanent damage. If I’ve been riding in freezing weather, I let the battery warm to room temperature before connecting a charger.

I also check terminal connections twice yearly as part of my regular maintenance routine. Even with perfect installation, vibration can gradually loosen connections over time. A quick check and retightening takes five minutes and prevents voltage drop issues.

Comparing Lithium to Traditional Lead-Acid Batteries

After running both lithium and AGM batteries across multiple Harleys, the performance difference is undeniable. Lithium batteries maintain higher voltage under load, which means stronger spark, better fuel injection performance, and more consistent electrical system operation. This is especially noticeable when combined with the right best oil for a Harley Davidson motorcycle for optimal engine performance.

The weight savings translate to real-world handling improvements. Removing 10-15 pounds from the front of my touring bike noticeably improved steering feel and reduced effort in slow-speed maneuvers. On lighter bikes like Sportsters, the difference is even more dramatic.

Cost-per-year is where lithium batteries really shine. While the upfront cost is 3-4 times higher than lead-acid, the 5-10 year lifespan versus 2-4 years for lead-acid means you’ll likely spend less over the long term. I’ve definitely saved money since switching to lithium three years ago.

Common Lithium Battery Myths Debunked

I’ve heard countless misconceptions about lithium batteries from fellow riders. The biggest myth is that lithium batteries don’t work in cold weather. While it’s true that lithium batteries have reduced capacity in extreme cold, quality motorcycle lithium batteries with proper cell chemistry start reliably down to 0°F in my experience.

Another common concern is fire risk. Lithium iron phosphate batteries used in quality motorcycle applications are extremely stable and have excellent thermal stability. I’ve never seen or heard of a legitimate lithium iron phosphate motorcycle battery catching fire when properly installed and maintained.

Some riders worry that lithium batteries can’t handle the vibration from Harley engines. Modern lithium motorcycle batteries are specifically engineered with robust internal construction and vibration-resistant mounting systems. I’ve run lithium batteries on rigid-mount Sportsters with zero issues.

Warranty and Support Considerations

Battery warranties vary significantly among manufacturers, and I’ve learned that warranty length matters less than the company’s actual support when issues arise. Antigravity and EarthX have both responded quickly when riders I know had questions or concerns.

I always register my batteries immediately after purchase and keep proof of purchase documentation. Most lithium battery warranties require registration within 30 days to remain valid. This takes five minutes and ensures you’re covered if problems develop.

Before purchasing any lithium battery, I check online communities and forums for real-world warranty claim experiences. A great warranty is worthless if the company doesn’t honor claims or makes the process difficult. The brands I’ve recommended here all have solid reputations for customer support.

Pairing Your Battery with Quality Components

Your battery works as part of a complete electrical and mechanical system. I’ve found that combining a premium lithium battery with quality components throughout your bike maximizes performance and reliability. Just as important as selecting the right battery is choosing what is the best oil for a Harley Davidson motorcycle to keep your engine running smoothly.

I also pay attention to my charging system health. A weak stator or failing voltage regulator will kill even the best lithium battery prematurely. I test my charging system voltage annually and replace components proactively rather than waiting for failure.

The quality of your electrical connections matters enormously with lithium batteries. Their low internal resistance means they’re more sensitive to voltage drops from corroded or loose connections. I use only high-quality terminals and cables, and I maintain them religiously.

Final Thoughts on Choosing the Right Lithium Battery

After years of testing and real-world experience with lithium batteries across multiple Harleys, I’m convinced that upgrading from lead-acid is one of the best modifications you can make. The combination of weight savings, improved starting performance, and longer lifespan delivers value that goes far beyond the initial investment.

For most riders, the EarthX ETX36C or Antigravity ATX20 will provide everything you need with proven reliability. If you’re on a budget, the Big Crank ETX36L delivers solid performance without the premium price. And for riders with heavily accessorized touring bikes, the Full Throttle FT500L provides the capacity to handle significant electrical loads.

Whatever battery you choose, pair it with a quality lithium-compatible charger and maintain it properly. These batteries are incredibly durable when cared for correctly, but they won’t tolerate neglect or improper charging. I’ve seen too many riders damage expensive lithium batteries by using incorrect chargers or maintenance practices.

The right lithium battery transforms your Harley’s performance while reducing weight and eliminating the frustration of dead batteries. Combined with proper maintenance including the right best motorcycle exhaust brands for Harley Davidson for complete bike optimization, you’ll enjoy reliable starts and superior electrical system performance for years to come. Make the switch—you won’t regret it.

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