Duracell has a very long history, well before its time with car batteries, and you might be interested to know where they're ...

Listen up: We tested 15 AA batteries—the type ... the cycle until the batteries die. Battery life was 7.3 hours for an Energizer, 6.8 hours for a Duracell, and 4 hours for a Toys "R" Us battery.

How long a battery can power a car if the charging system fails. A higher score reduces the risk of failure if accessories are left on. The Duracell 51R is part of the Car Batteries test program ...