Review on 🔋 Ultimate Cordless 31Accessories 2X3900mAh Batteries: A Professional's Dream by Girish Underwood

I only have 1 complaint, when bits (screwdrivers) get blocked they seem to loosen over time in the charger there is BMS (US 110/120) = Me am afraid to do your own charger. and can (will) cause the battery to explode if the charger charges above 12.2V (the DMM will show 12.2V on a full battery) - if you need a spare charger - will be hard to find. I want the BMS to be in the battery. So I can make a 12v/14v charger (need to use an inverter to change this), well designed - looks like it's tuff - 25 leva power changes work fine at all settings.