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.

mAh after 300 charge/discharge cycles:

• IKEA Ladda 2450 = 2017 mAh
• Duracell 2450 = 2007 mAh
• Silver Amazon Basics 2400 = 1864 mAh
• Black Amazon Basics 1900 = 1526 mAh
• Eneloop 1900 = 1400 mAh

Internal Resistance:

• IKEA Ladda = 70u Ohms
• Duracall = 71
• Eneloop = 78

IKEA Ladda: https://amzn.to/3j43iz6

Charger/Tester: Powerex MH-C9000
Testing internal resistance: Opus BT-C3400 Charger