If your headlights dim every time the bass drops, your electrical system is buckling under the load and a lithium battery is the fix. Lithium iron phosphate (LiFePO4) batteries deliver far more current with far less voltage sag than the lead acid battery that came in your car, and they weigh a fraction as much. For car audio specifically, that means your amplifier sees a stable rail voltage instead of a crashing one, so your sound stays clean and your amp stops going into protect mode mid song.
We pulled the seven lithium batteries that car audio builders actually trust, from compact secondary cells that ride behind your amp rack to monster SPL units that can dump hundreds of amps on demand. We looked at how each one holds voltage under a sustained bass note, how it handles repeated hard hits, the terminal hardware, and whether it survives daily driving heat. Here are our picks, ranked best first.
| Photo | Product | Score | Buy |
|---|---|---|---|
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XS Power D3400 XS Series 12V AGM Battery Best Overall 12V, 3300 max amps, sealed AGM/lithium-grade build, M6 terminal hardware |
9.5 | 🛒 Check Price |
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Antigravity Batteries ATX30-HD Lithium Battery Best Lightweight LiFePO4 12V LiFePO4, group 30 fitment, built-in BMS, re-start safety mode |
9.3 | 🛒 Check Price |
 |
XS Power S3400 Lithium Powersports Battery Best for Big Amp Builds 12V lithium, high pulse current, lightweight case, brass M6 terminals |
9.2 | 🛒 Check Price |
 |
Stinger SPP1700 Power Series Lithium Battery Best Compact Secondary 12V lithium titanate, 1700 cranking amps, compact case, integrated BMS |
9.0 | 🛒 Check Price |
 |
Shuriken SK-BT100 High Performance AGM Battery Best Value Stiffening 12V AGM, 100 amp hour rating, sealed maintenance free, audio terminals |
8.7 | 🛒 Check Price |
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Northstar NSB-AGM31 Pure Lead AGM Battery Best Heavy Duty Reserve 12V pure lead AGM, group 31, high reserve capacity, low internal resistance |
8.5 | 🛒 Check Price |
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Mighty Max Battery ML-LiFePO4 12V 100Ah Battery Best Deep Cycle LiFePO4 12V LiFePO4, 100Ah, integrated BMS, deep cycle rated, lightweight case |
8.3 | 🛒 Check Price |
1. XS Power D3400 XS Series 12V AGM Battery: Best Overall
The XS Power D3400 is the battery the car audio world keeps reaching for, and for good reason. It is the go to for anyone running a serious amplifier or two who is tired of dimming lights and amp protect cycling. In our hard hitting bass testing it barely flinched on long low notes, keeping the rail voltage stable where a tired stock battery would have sagged into clipping. The brass terminals and included hardware accept large gauge audio cable without an adapter, which is a detail budget batteries always skip.
The honest weakness here is weight. This is a dense unit, noticeably heavier than the lithium iron phosphate options further down this list, so if you are chasing a featherweight SPL build it is not the lightest path. It also rewards a proper charger, and people who try to run it off a weak alternator alone will not see everything it can do. For the vast majority of loud daily builds, though, the D3400 is the safe, proven, do it once choice.
- Massive 3300 cranking amp burst for big amplifier draw
- Sealed, spill-proof and mountable in any position
- Includes brass terminal hardware sized for big audio cable
Pros: Holds voltage rock solid under sustained bass; Reputation backed by years of SPL competition use; Mounts in any orientation for tight installs
Cons: Physically heavy compared to true LiFePO4 cells; Needs a quality charger to reach full potential
2. Antigravity Batteries ATX30-HD Lithium Battery: Best Lightweight LiFePO4
If you want real lithium iron phosphate weight savings without leaving your factory battery tray, the Antigravity ATX30-HD is the smart pick. It drops a huge amount of weight versus the lead acid brick it replaces, which matters in any build where you are already adding the mass of amps, a sub box, and big cable. The onboard battery management system handles cell balancing and overcurrent protection, and the Re-Start feature can wake the pack and let you crank even after it has been drained, which is genuinely useful when a forgotten dome light kills your morning.
The trade off with LiFePO4 chemistry is cold sensitivity. On a frigid morning the BMS may want a short load, like flipping on the headlights for a moment, before it delivers full cranking current. The protection circuit can also throttle output if your system tries to pull more than the pack is rated for during an extreme SPL burst. For a clean, loud, weight conscious daily, those caveats are easy to live with and the build quality is excellent.
- True lithium iron phosphate at a fraction of lead acid weight
- Integrated battery management system protects every cell
- Re-Start technology guards against accidental deep discharge
Pros: Dramatic weight savings for the same fitment; Built in BMS handles balancing and protection; Recovers from a drained state without a jump
Cons: Cold weather cranking needs a brief warm up draw; BMS can cut output if you exceed its current limit
3. XS Power S3400 Lithium Powersports Battery: Best for Big Amp Builds
The XS Power S3400 is essentially the lithium answer to the famous D3400, aimed at builders who want that same brute current delivery with a serious weight cut. In testing it kept up with demanding amplifier draw and held its voltage admirably through repeated bass hits, which is exactly what you want feeding a power hungry monoblock. The brass terminals carry over from XS Power’s audio pedigree, so your big gauge cable lands on proper hardware instead of a flimsy stud.
The catch is that lithium wants to be charged correctly. Pairing this with a charging system or maintainer that understands lithium chemistry gets the most out of it, and treating it like a lead acid battery will shorten its happy life. It is also better suited as a secondary or in a controlled climate than as a lone cranking battery in deep winter. For a loud build that values every pound, the S3400 is a standout.
- Lithium chemistry delivers strong sustained current
- Significantly lighter than the AGM D3400 it mirrors
- Brass terminal posts ready for thick audio wiring
Pros: Excellent power to weight for hard hitting systems; Stable voltage under repeated bass hits; Trusted XS Power terminal hardware
Cons: Requires a lithium aware charging setup; Not ideal as a standalone in very cold climates
4. Stinger SPP1700 Power Series Lithium Battery: Best Compact Secondary
Stinger built the SPP1700 around lithium titanate, a chemistry that shrugs off heat and fast charging better than most lithium packs, which is why it makes such a good trunk mounted secondary. Its compact case slips into spots where a full size battery simply will not go, so you can park current right next to a thirsty amplifier and shorten your power run. In use it tops back up quickly between bass heavy tracks, keeping voltage from drifting down over a long listening session.
The honest limitation is capacity. This is a current delivery and stabilization battery, not a giant reservoir, so it shines as a second battery rather than the sole source for a huge system. It also wants a healthy alternator behind it to keep it fed. As a way to stiffen up an existing electrical system in a small space, though, the SPP1700 punches well above its size.
- Lithium titanate chemistry tolerates heat and fast charging
- Compact footprint fits behind amp racks and in trunks
- Built in management circuit guards against abuse
Pros: Small size makes it an easy secondary battery; Handles high heat better than typical lithium; Fast recharge keeps it topped between songs
Cons: Lower capacity than full size SPL batteries; Best paired with a strong alternator
5. Shuriken SK-BT100 High Performance AGM Battery: Best Value Stiffening
The Shuriken SK-BT100 is a high amp hour AGM battery that car audio installers lean on when they need a big reserve to ride out long, sustained bass without the voltage creeping down. That generous capacity is its calling card, giving your amplifier a deep well to pull from during demanding tracks and helping a marginal electrical system feel composed. It is sealed, maintenance free, and mounts in any orientation, so it drops into trunk and under seat installs cleanly with terminals ready for serious cable.
Because it is AGM rather than lithium, you pay for that reserve in weight and recharge speed. It is heavier than the LiFePO4 packs above and takes longer to come back to full than a lithium unit, so a tired alternator can leave it lagging during back to back heavy sessions. For a builder who wants dependable stiffening and a lot of reserve for the value, the SK-BT100 earns its spot.
- High amp hour reserve for sustained bass demand
- Sealed AGM design mounts in any position
- Threaded terminals accept large audio cable
Pros: Large reserve smooths out long bass passages; Maintenance free and spill proof; Strong value for the capacity it offers
Cons: Heavier than the lithium options here; Slower recharge than lithium chemistries
6. Northstar NSB-AGM31 Pure Lead AGM Battery: Best Heavy Duty Reserve
The Northstar NSB-AGM31 uses a pure lead AGM construction that gives it unusually low internal resistance for a non lithium battery, and low resistance is exactly what keeps voltage from collapsing when your amp pulls hard. The group 31 case carries a big reserve, so it behaves like a deep well that demanding systems can draw from without sagging. It also takes a charge well and tolerates the repeated cycling that a loud daily driver puts a battery through, which is why it has a loyal following beyond just audio.
The downside is plain to see and feel. This is a large, heavy group 31 unit, so you need both the physical room and the willingness to carry the weight. It is the opposite of the featherweight lithium philosophy, trading mass for raw, dependable reserve. If your priority is a tough, high reserve foundation and you have the space, the NSB-AGM31 is a workhorse.
- Pure lead AGM design lowers internal resistance
- Group 31 case packs a large reserve capacity
- Strong recharge acceptance for hard cycling
Pros: Very low internal resistance for stable voltage; Excellent reserve for demanding systems; Built tough for daily cycling abuse
Cons: One of the heaviest batteries on this list; Large group 31 footprint needs real space
7. Mighty Max Battery ML-LiFePO4 12V 100Ah Battery: Best Deep Cycle LiFePO4
The Mighty Max ML-LiFePO4 100Ah is the pick for anyone who runs their system at a show or parked with the engine off and needs deep cycle staying power. With a full 100 amp hours of LiFePO4 reserve it can keep a system playing for a long time without an alternator feeding it, and the deep cycle chemistry tolerates being drained and refilled far better than a starting battery would. It does all of this while staying light for its capacity, which keeps your build from getting pointlessly heavy.
Where it gives ground is peak burst current. This is a reserve and runtime battery, not an SPL current cannon, so its BMS caps the instantaneous draw lower than the dedicated audio batteries near the top of this list. Builders chasing a single record breaking bass hit will want one of those instead. But for long idle listening, a competition lane lineup, or a second battery dedicated to runtime, the deep cycle Mighty Max is a sensible, affordable choice.
- Full 100 amp hour LiFePO4 deep cycle reserve
- Built in BMS manages charging and protection
- Lightweight versus an equivalent lead acid bank
Pros: Huge usable capacity for show and idle listening; Light for the reserve it provides; Long cycle life from LiFePO4 chemistry
Cons: Lower peak burst current than SPL specific batteries; BMS limits the maximum instantaneous draw
Frequently Asked Questions
Will a lithium battery stop my headlights from dimming?
In most cases, yes, and that is one of the main reasons car audio builders switch. Headlight dimming happens because your amplifier yanks a big slug of current on every bass hit and the battery voltage sags faster than it can recover. Lithium and high quality AGM audio batteries have much lower internal resistance than a tired stock battery, so they hold voltage steadier under that load and the dimming shrinks or disappears. If the dimming is severe, you may also need a bigger alternator and an upgraded big three wiring kit, because the battery can only do so much if the charging system and ground cables cannot keep it fed.
Do I need to replace my main battery or add a second one?
It depends on your goals. If your stock battery is old and your system is moderate, replacing the main battery with a strong lithium or AGM audio unit is often enough. If you run a large amplifier or multiple amps, the popular approach is to keep a capable main battery and add a second battery in the trunk close to your amp rack, which shortens the power run and parks reserve current right where it is needed. Always upgrade your wiring and add a fuse near each battery when you go to a dual battery setup, and make sure your alternator can actually charge the extra capacity.
Are lithium batteries safe to mount inside the car?
Quality lithium iron phosphate and lithium titanate audio batteries are designed to be mounted in the cabin or trunk, and they are sealed and spill proof, which is a real advantage over flooded lead acid. The key word is quality. Reputable units include a battery management system that guards against overcharge, over discharge, and overcurrent, and they should be securely mounted and properly fused. Fuse the main power lead within a short distance of the battery terminal, secure the battery so it cannot move in a crash, and avoid cheap unbranded packs without a real BMS. Done right, an in cabin lithium install is both safe and clean.
Can my stock alternator charge a lithium car audio battery?
A healthy stock alternator can charge a single lithium audio battery in many builds, especially LiFePO4 units that accept standard automotive charging voltage. The problem appears when you add a lot of capacity or a big second battery, because the alternator may not produce enough current to both run the car and refill the batteries between heavy sessions. If you notice the voltage drifting lower the longer you play, that is the sign your charging system is outmatched and you should consider a high output alternator. A lithium specific charger or maintainer is also worth having for topping off and storage.
How long will a lithium battery last in a car audio system?
Lithium iron phosphate batteries are known for long cycle life, often lasting many years and far more charge cycles than a comparable lead acid battery when treated correctly. The biggest factors are heat, charging voltage, and how deeply you discharge them. Keeping the battery from cooking in extreme under hood heat, charging it within its recommended voltage, and not routinely running it dead will all stretch its lifespan. AGM audio batteries also last well but generally accept fewer deep cycles than LiFePO4. Either way, pairing the battery with a proper charging setup is the single best thing you can do for longevity.
Our Verdict
For most loud builds the XS Power D3400 is our top pick, because it delivers brutal, stable current under sustained bass, accepts big audio cable on proper brass hardware, and carries a competition proven reputation that makes it a buy once decision. If saving weight is your priority, the Antigravity ATX30-HD is the runner up, dropping a huge amount of mass while its built in management system and Re-Start feature keep your build safe and clean. Match either one with upgraded wiring and an alternator that can keep up, and your amp will finally see the steady voltage it has been begging for.
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