Lithium car batteries get marketed on weight savings and long cycle life, both real advantages of the chemistry, but the number that actually gets your engine started on a cold morning is cranking amps, and that is where a lithium battery has to prove itself against the flooded lead-acid and AGM batteries most cars still ship with. No dedicated lithium car battery test exists in the testing corpus behind this guide, so this is an honest gap to acknowledge up front. What does exist is a rigorous, measured comparison of 6 traditional car batteries on the exact cold-cranking metrics that matter, and that data sets the real bar any lithium upgrade needs to clear.
What the testing showed
The numbers below come from Project Farm's car battery comparison, a 6-battery test covering EverStart, Optima RedTop, DieHard Advanced Gold, SuperStart Premium, Duralast Gold, and AutoCraft Silver. None of these six are lithium batteries, four are flooded lead-acid and two are AGM, so this guide is upfront that the specific chemistry a "12 volt lithium battery" shopper is considering was not part of this test.
Budget pick
EverStart
Price shown in test: $119.76
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Each battery went through a cranking amps test at 75F, followed by a 42 to 44 amp load test for 30 minutes with an overnight recovery check.
The cheapest battery in the test posted the strongest numbers
The EverStart, at 119.76 dollars, the least expensive battery tested, produced 1,115 cranking amps at 75F with an internal resistance of 3.48 milliohms. After the load test and overnight rest, it measured 12.59 volts and 999 cranking amps, described as fully charged since it sat above the 12.6-volt recovery threshold.
The DieHard Advanced Gold posted the highest cranking amps of all six batteries at 1,148, along with the lowest internal resistance in the field at 2.69 milliohms. Overnight, it dropped from a peak of 13.1 volts to 12.49 volts and 1,032 cranking amps, a real but manageable overnight loss.
The AGM batteries had the lowest resistance but the weakest recovery
The Optima RedTop, an AGM battery at 224.99 dollars, the most expensive in the test, confirmed the AGM advantage on internal resistance, posting 2.76 milliohms, lower than every flooded battery tested. But after the overnight load-and-rest cycle it measured only 12.26 volts and 964 cranking amps, "the weakest overnight recovery of all six," described as definitely needing a recharge. That is a specific, measured tradeoff: AGM chemistry showed a real resistance advantage but not an automatic recovery advantage in this test.
The mid-pack flooded batteries
SuperStart Premium, at 139.99 dollars, posted 1,133 cranking amps and the best internal resistance of the four flooded batteries at 3.42 milliohms. Duralast Gold, at 159.99 dollars, produced only 1,022 cranking amps with a weaker 3.84 milliohm resistance than the far cheaper EverStart. AutoCraft Silver, at 139.99 dollars, posted 1,083 cranking amps but the weakest overnight recovery of the four flooded batteries, dropping to 12.34 volts and 920 cranking amps.
How to read this for your own purchase
Since a true lithium car battery was not part of any cited test, use these tested cranking-amp and recovery figures as the specific bar a lithium upgrade needs to clear, and verify any lithium product's claims against numbers like these rather than against marketing copy alone.
A 12-volt lithium car battery's real selling point is weight and cycle life, not necessarily cranking amps. The flooded and AGM batteries in this test posted cranking amp figures from 1,022 to 1,148, and internal resistance figures the AGM chemistry beat cleanly. A lithium battery marketed for automotive starting duty should be able to match or beat these tested numbers, and a listing that does not publish a comparable cranking amp figure is not giving you enough information to judge it against a known battery.
Overnight recovery matters as much as peak output. The Optima's weak overnight recovery despite class-leading internal resistance shows that one strong spec does not guarantee overall performance. Ask the same two-part question of any lithium battery: what does it do fresh, and what does it do after a real load and a rest period.
Ask specifically about cold-weather performance claims, since lithium chemistry behaves differently than lead-acid at low temperatures. The batteries in this cited test were all lead-acid or AGM, chemistries with well-understood cold-cranking behavior. Lithium iron phosphate cells used in many 12-volt lithium car batteries can see a more pronounced power drop in freezing temperatures unless the product includes internal heating elements, a feature none of the tested chemistries here required, and worth confirming directly on any lithium product before a winter purchase.
A few universal rules this test supports for any 12-volt battery purchase, lithium included:
- Price did not track performance cleanly among traditional batteries. The cheapest battery in the test, EverStart, posted stronger numbers than the pricier Duralast Gold on both cranking amps and internal resistance.
- Confirm compatibility with your vehicle's charging system before switching chemistries. Lithium batteries often require a battery management system or specific charging profile that a standard alternator was not designed around, a consideration that does not apply to swapping between flooded and AGM batteries of the same group size.
- A verified cold cranking amp rating, tested and not just claimed, is the single most useful number on any car battery, lithium or otherwise, for judging real-world starting reliability.
Keep comparing the gear that keeps a car running on the jump starters and car power hub.