Car and garage buying guides for American drivers: jump starters, car batteries, battery chargers and maintainers, battery testers and portable tire inflators. We size every recommendation to your vehicle, check it against the owner’s manual, and look at years of Amazon sales, price and review history before anything makes our list. Start with our guides to choosing a jump starter, a car battery charger and a portable tire inflator, learn to test your battery with a multimeter, then browse every pick and how-to below.
We compared Keepa sales history and manufacturer specs to find six RV battery maintainers for deep-cycle house banks, chassis batteries and lithium (LiFePO4) setups.
We compared six smart lawn mower battery chargers and maintainers using Keepa sales history and manufacturer manuals to keep 12V and 6V mower batteries alive without overcharging.
The best solar car battery charger for most drivers is a 10 to 20 watt panel with a real charge controller; here are the three picks that passed our Keepa and brand checks, plus sizing math.
If your car battery won’t charge, the battery may be below your charger’s minimum voltage, the clamps or mode may be wrong, or the battery may be sulfated; here is how to tell by voltage.
Yes, you can overcharge a car battery with a manual charger, the wrong setting or a failing alternator; here are the voltage red lines, warning signs and which chargers are safe to leave on.
The best marine battery charger is an onboard, waterproof, ignition-protected unit built to UL 1236 marine and ABYC A-31; here are the two that passed.
Yes, you can charge a car battery without disconnecting it with a smart charger; here is the clamp order, the decision table and when to disconnect.
We checked 13 lithium chargers and picked the three best LiFePO4 battery chargers for 12V batteries, sized by battery and backed by real safety listings.
Three smart car battery chargers that passed our Keepa sales-history, spec and safety-listing checks, with an amp sizing table to match your battery.
How long it takes to charge a car battery at 2, 10 and 40 amps, with a charge-time table and the simple formula behind it.