24V 10AH Silver Fish Lithium Li-ion E-Bike Battery Recharging for 250W Bicycles with 29.4V2A Charger Bottom Discharging Fit for the 250W E-Bike Lithium-ion battery with charger Bottom 4 holes discharging socket Size?mm): L75* W110*H390 PCB board Protection:Over charge,over discharge,over load and short circuit.