Life test measures how a battery endures repeated charge-and-discharge cycles at hot-climate engine-compartment temperatures. The more cycles endured while maintaining a higher voltage, the higher ...

The Duracell Ultra Platinum AGM SLI65AGM is part of the Car Batteries test program at Consumer Reports. In our lab tests, Car Batteries models like the Ultra Platinum AGM SLI65AGM are rated on ...

Nearly everything else has changed with Absorbed Glass Mat (AGM) batteries taking the industry by storm. For a crash course on how car batteries work, check out this Youtube video. Invented in ...