Duralast Platinum AGM 47 H5-AGM Car Battery Review

The Duralast Platinum AGM 47 H5-AGM is part of the Car Batteries testing program at Consumer Reports. In our lab tests, Car Batteries models such as the Platinum AGM 47 H5-AGM are rated on multiple criteria, such as those listed below.

Life:
The life test measures how well a battery withstands repeated charge and discharge cycles in hot climate engine compartment temperatures. The more cycles that can be endured while maintaining a higher voltage, the higher the score.

Reserve capacity:
Reserve capacity estimates how long batteries can power a car if the charging system fails.

CDC:
CCA performance reflects the voltage across our load, which is half the claimed average CCA for each group size after 15 seconds of cranking at 0º F. We charged the batteries at the 14.5 volts that vehicles typically provide, rather than the higher voltage that manufacturers use. Batteries charged at the lower voltage met BCI voltage standards for a fully charged battery.