1.326650 li-ion batteries 2.CE,ROHS,UL Approval 3.Use for bluetooth,game player,gps,gift 4.With BMS or PCM Item: Cheapest ... 3.7v 4000mAh 26650 li-ion batteries use for external battery pack ... , overheating, smoke emission, bursting and/or ignition. 5) Use specific Polymer charger only. Do not use a Ni-MH or Ni ...