USE A LiPo BALANCE BATTERY CHARGER ONLY! ALWAYS CHECK CELL VOLTAGES BEFORE AND AFTER CHARGING. MINIMUM CELL VOLTAGE 3.3V. FULLY CHARGED VOLTAGE IS 4.20V CELL MAX. MAXIMUM CHARGE CURRENT 3C. DO NOT LEAVE THE BATTERY UNATTENDED DURING CHARGING PROCESS. ALWAYS USE A CHARGING BAG WHEN CHARGING. STOP USING THIS BATTERY IF THE TEMPERATURE EXCEEDS 70C OR THE CELLS SWELL AND EXPAND. FAILURE TO COMPLY MAY RESULT IN AN EXPLOSION, FIRE AND VENTING OF THE CELLS.