The Powerline 8 can charge AA and AAA rechargeable batteries and the different sizes can be charged simultaneously. Battery levels prior to charging are not important when using this unit and it is suitable for all brands of AA/AAA rechargeable (NiMH/NiCd). Once a battery is fully charged, the charging process is automatically stopped and switched to trickle charging (with current pulses) to ensure optimal performance and counteract battery self-discharge. A clear LED display shows each slot's progress for the current program mode. There is also a USB A outlet for charging accessories such as mobile phones, tablets, etc. Includes 8pcs of Ansmann Max E AA2500mAh batteries.