I have to watch a YouTube video to learn how to use it. Maybe yours came with instructions? I tried to use it, but my batteries never charged, though they all had green colored lights. It seemed straightforward when I went to charge my batteries. They were all the same brand, but the number ratings on them are different, so maybe that has something to do with it? There is a small explanation on the box of what it does.
Fireproof Battery Organizer Storage Case: Waterproof & Explosionproof Safe Bag Fits 210+ Batteries - With Tester BT-168, Carrying Container Bag For AA AAA C D 9V Lithium 3V Holders
49 Review
5-Pack EBL 9V Rechargeable Lithium Ion Batteries With 600MAh Capacity And 5-Bay Charger For Smoke Alarm Detectors - 2A Input
34 Review
EBL AA Rechargeable Batteries 4 Pack + Individual Cell 🔌 916 Battery Charger - Combo Deal for Rechargeable AA/AAA Ni-MH/Ni-CD Batteries
35 Review
EBL Rechargeable AA Batteries 2300mAh - Long Lasting Battery (8 Counts) + Charger for AA AAA Batteries
47 Review