Make the most out of your rechargeable batteries with the Powerline 4.2 Pro Charger from Ansmann. This versatile, intelligent battery charging system can accept up to four AA or AAA rechargeable cells in any combination. Each slot is individually charged and monitored. You can choose from various programs and charging currents for each charging slot using a separate button. This professional battery charger features four charging programs available to charge, discharge, refresh (repeated discharging & charging to revitalise old rechargeable batteries), or have their capacity tested. It allows adjustable charging rates for each slot400mA, 600mA, or 800mA for one to four batteries and 400mA, 600mA, 800mA, 1500mA, or 1800mA when only one or two cells are undercharging. Once a battery is fully charged, the charging process is automatically shut down and changed to trickle charging for optimum performance.