36V 10Ah Lithium Ion Li-Ion Replacement Ebike Battery For Motor 250W 350W 500W. (the middle is empty). It is not 4 pins. Size is 39117.5cm. Please confirm it is for your bike. If you don’t know, please send message to me to confirm. The discharging positive (-) is on the key and charging socket side. Please make sure the polarity. 1 x Lithium Battery. 1 x User Manual. 1 x Battery Fixed Plate. Fit for 36v E-bike and your motor should be 36v 200W-500W. Battery Type:Fish Lithium-ion. Rated Voltage / capacity: 36V / 10Ah. W: 3.26KG/3.66KG. (inch):L15.35W4.33H2.95. Case Material: ABS+Aluminium alloy. Batteries combinations:10-S, 5-P. Component:Li(NiCoMn)O2. Recommend to use:200W-500W. Discharge Standard current:10A-13A. Discharge Max current:28A-30A. Discharge Cut-off voltage:30V. Discharge cycle life:800 times. Discharge method :Bottom discharge. Installation position:Inside on the PCB Diameter(mm):5 Length(mm):30 Current:30A. Charging:0°C45°C Discharging:-20°C60°C Storage:0°C30°C. PCB board Protection:Over charge, over discharge, over load and short circuit. BMS board Protection:BMS is used to supervise battery by measure its voltage, temperature, current and SOC (State Of Charge), give out alarm under wrong circumstance, cut off electric power link in severe situation in order to protect battery and make its life longer. BMS can balance energy among batteries to make them more identical and expand its discharge cycle. ECheque will be held until cleared. Handing Time :1-15 days. We have warehouse in UK/USA/China/Australia/Czech Republic. If you have not received the goods for too long, please. Do not open a case or return request. Before keeping in touch with us. We can solve your problem as soon as possible. Customer satisfactory is most important to us. If you have any questions, please feel free to contact me! Please give me at least 24 hours to reply! 6:00 p. (GMT+8) of Monday to Friday. And our company is closed on Sunday and public holiday (China). We apologize for the late reply during the holidays! But hope that our customers give us their understanding. If you are dissatisfied for any reason, please do not be quick to leave negative/neutral feedback. We work hard to make sure EVERY CUSTOMER 100% SATISFIED and resolve any problem for you.