With a smart 12V trickle charger and maintainer, you can revive your car battery in a relatively short amount of time. And this one from GPED is discounted to $22 on clearance at Walmart , 56% off ...

A rule of thumb is to choose a charger that delivers 10 to 20% of your battery's Ah rating (a 6A charger is ideal for a 6Ah battery). Lastly, the charger output dictates its purpose.

Husgw 12V 10A Battery Charger, $23 (was $139) at Walmart. This battery charger can be used on both 12V and 24V batteries found in cars, trucks, motorcycles, RVs, ATVs, golf carts, and more.

The 12V jack in a car (once the cigarette lighter) is a pretty common place for many of us to put a USB charger these days. In a lot of car models, th ...