Smart charger for 4 cell Li-ion battery pack 4 cell Li-ion charger, battery chargerReverse polarity protectionSensing ... the battery voltageConstant output current to protect both battery pack and chargerLowering voltage once charge completedDIscoloring LED displaying working ... , BS, SAA, EK, PSE, CB, FCC, EMC, C-tick ,RoHS Input :100-240VAC, 50/60HzOutput voltage : 17 VDCOutput current : 6000 ...