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, appreciating its versatility and ease of use, with one customer noting it can handle both button top and flat top lithiums. They like its capacity measurement feature and adjustable charging rates, with one mentioning it can set current to 200, 300, 500, 700, or 1000. While some customers find it worth the money, others consider it pricey, and while it helps maximize battery life, some report it killed new 18650 Li-ion cells.