This hailong type lithium battery use Panasonic and LG 18650 battery cell, no memory effect, recharge up to 800 cycles. Have a streamline appearance design , install on the bottle cages. Built-in BMS (BATTERY MANAGEMENT SYSTEM),protect the battery to avoid overcharge and over discharge. Provide 36v 13ah,48v 10.4ah,48v 11.6ah and 48v 14ah four kinds capacity for optional. Technical Parameters Nominal Voltage : 36V 13Ah / 48V 10.4Ah / 48V 11.6Ah / 48V 14Ah Battery Material : Li-Polymer Battery Cell : LG / Panasonic 18650 Dimension : 37*9*9(cm) Rated Discharge Current : 20A 25A 30A 30A Max Discharge Current : 25A 30A 35A 35A Cycle Life : 800(70%)