[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 ...

2 9v batteries, 2 AA batteries and a FireWire connector, adding about 10 hours of extra play–good for that international flight you’d likely miss when the man sees this in your bag.

Is anyone giving or receiving a holiday gift labeled "batteries not included"? We thought so. Listen up: We tested 15 AA batteries—the type typically used in digital cameras, flashlights ...

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 ...

The following rechargeable batteries are all top-notch and available in AA and AAA models. Keep reading to discover our favorite rechargeable batteries, including affordable bulk packs and ...

It worked fine in all three. Yes. But here's what I didn't know: AA and AAA batteries put out the same 1.2- to 1.5-volts.