Operating voltage rang: DC 11.0~ 18.0 volt AC to DC adaptor ( DC 11.0~ 18.0V/ 5A) Circuit power: Max. charge power 50W Max. discharge power 5W Charge current range: 0.1~ 5.0A Discharge current range: 0.1~ 1.0A Current drain for balancing Li-po: 300mAh/ cell NiCd/ NiMH battery cell count: 1~ 15cell li-ion/ Polymer cell count: 1~ 6 series Pb battery voltage: 2V~ 20V