A battery that registers 12.7 volts (unloaded) is at 100% charge; 12.46 volts equates to an 80% charge, and 12.2 volts would ...

Amazon’s Prime Day 2025 sales event is here and there are excellent deals to be found on chargers and power banks. This year, ...

A battery maintainer is a must-have for anyone who stores a vehicle for extended periods of time. Think classic-car collectors, motorcycle owners, RV and boat enthusiasts, ...

Many chargers double as maintainers, but you don't need many amps just to keep a battery topped up. Photo credit: David Traver Adolphus / AutoGuide.com.

This battery maintainer is an all-weather charger, maintainer, trickle charger, and battery desulfator, making it perfect for all 12-volt lead-acid, flooded or sealed maintenance-free batteries.

Fast chargers can charge your phone or tablet in half the time thanks to a special power delivery protocol. Here's how it ...

Panasonic’s Eneloop BQ-CC55, our favorite charger for AA and AAA rechargeable batteries, is sleek, compact, easy to use, and plugs directly into a wall outlet.