10 brands of rechargeable batteries tested for nearly a year. Additional set of rechargeable batteries tested for shelf life (battery self-discharge) after nearly a year. Initial voltage, internal resistance, and milliamp hour capacity tested. Brands: Panasonic Eneloop, Amazon Basics Silver and Black, EBL, Rayovac, PowerEx, Harbor Freight Thunderbolt, IKEA LADDA, Duracell, and Energizer.

At viewer request, below are the battery chargers used in the video. I am not affiliated with Amazon and do not earn a commission if you purchase either charger. Highly recommend shopping around to find a better price.