Opus Battery Charger Analyzer Tester for Li-ion NiMH NiCd Rechargeable Batteries C3400 BT-C3400 AA AAA C 18650

Customers find this battery charger to be the best they've owned, with exceptional performance and the ability to charge everything from AAA to 18650 batteries. The device is easy to use, measures capacity, and offers adjustable charging rates, while effectively extending battery life. While some customers consider it worth the money, others find it a bit pricey.