How I check, test, and charge my AA and AAA batteries - and sift out defective ones

I've been a fan of Olight flashlights for many years. Now I'm a fan of its new pro-grade battery charger. Here's why.

This $5 essential gadget helps you get the most out of your batteries

If you have a drawer or box full of old batteries that may or may not be working, this gadget will help more than testing them one by one on a remote.