Stuck with a dead flashlight and no D batteries? Discover the $7 hack that converts your kitchen drawer's AA batteries into a reliable backup power source.

We wonder if the D-Cell battery suffers from low self-esteem, as it’s never been as popular as rivals AA and AAA. Another blow to D’s self-image is the Battery Converter, a plastic case the size and ...

Promising up to 10 times the power and longevity of batteries, the DCell BoostCap ultracapacitor is offered as the industry's first based on the form factor of a standard D-cell battery. According to ...