The powerline 4 pro is a multifunction fast charger for 1 4 aa or aaa batteries with a charging current of up to 1800ma the powerline 4 pro also cares for the condition of rechargeable cells battery refresh overheat protection and automatic shutdown all help to preserve the life cycle of each battery the issue of self discharge in rechargeable cells is perfectly managed here by the trickle charge function cells are individually controlled with the capacity of each displayed in mah on an