Unlock to see our ratings and compare products side by side Life test measures how a battery endures repeated charge-and-discharge cycles at hot-climate engine-compartment temperatures. The more ...

Q: Recently our 2002 Mercury Sable would not start. A salesman at an auto-repair center looked for the correct battery replacement on his computer. It showed group 36R as the correct one. He did not ...

To help our members make a smart decision about replacing their car battery, Consumer Reports tests more than 100 individual car batteries in our lab every year. And not just once—in fact, we test ...