Slim, faster chargers with intelligent safety and technical features that charge up to 8 AA or AAA batteries at the same time. The sturdy cassette also serves as a battery holder, in which the batteries can be stored securely.Each charger fully charges 2 batteries in approximately 2 hours or 4 batteries in approximately 4 hours via a USB port (AA batteries with 2100 mAh). The LED display in two colors shows the charging status and indicates whether disposable or bad batteries were inserted New with this charger is the function ""battery status check". With this function, you can quickly and easily check whether your batteries are still sufficiently charged or need to be recharged. You can thus avoid unexpected situations with flat batteries and avoid unnecessary charging of your batteries.Other safety features include automatic power-cut timer and DV full charge detection to help prevent overcharging, over-voltage and short circuits, and battery life degradation.This versatile battery