4 Pieces 18650 4200 mAh 4.2v Li-ion Lithium Ion Rechargeable Battery Household Batteries With 2 Slot LED Indication Charger , Gray Color Battery High quality and durable, No memory effect; Provides excellent continuous power sources to your device; 2 slot LED indication AC110v-240v 50-60Hz input (international charger, can be used worldwide);