Listen up: We tested 15 AA batteries—the type typically used in ... of turning a flashlight on for 4 minutes every hour for 8 hours, letting it sit for 16 hours, and repeating the cycle until ...

[Ray’s] breadboard power supply lets you drain the last traces of power from ‘dead’ AA batteries. Electronics that are powered off of disposable alkaline batteries have a cutoff voltage that ...

Our evaluation included extensive discharge tests to find long-lasting alkaline batteries -- including AA, AAA, C, D and 9-volt options. We also considered the cost per battery for each option to ...

Unlock to see our ratings and compare products side by side The Energizer Ultimate Lithium AA is part of the Batteries test program at Consumer Reports. In our lab tests, AA batteries models like ...