ACDelco Gold 49AGMHR Battery vs Duracell Ultra U1 Lawn & Garden Battery

These are not really rivals: the ACDelco Gold 49AGMHR is a full-size Group 49 AGM car battery with 900 CCA and 95 Ah, while the Duracell is a small U1 lawn-and-garden battery rated 350 CCA. For a Mercedes S320 or any car needing Group 49, buy the ACDelco; the Duracell cannot crank a large engine and is not a substitute. The ACDelco is the stronger product on build and capacity, backed by GM and a 36-month warranty. The Duracell's 3.1 out of 5 rating from 11 owners is thin and lukewarm, so treat it as a small-equipment battery only.

• Choose the ACDelco Gold 49AGMHR if you need a Group 49 AGM battery for a car, SUV or van, especially a Mercedes S320 or a GM vehicle that specifies AGM.
• Choose the Duracell U1 if you are replacing the battery in a lawn tractor, riding mower, kart lift stand or other small equipment that takes a U1 case.