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. 1 x Lithium Battery with ABS case(Base discharge).Customer satisfactory is most important to us. Please give us at least 24 hours to reply! Our office hour:-9:00a. (GMT+8) of Monday to Friday. The item "X-GO 36V 10Ah 350W-500W HaiLong Lithium Battery Pack for E-Bike Electric Bicycle" is in sale since Wednesday, December 13, 2017. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Electric Bicycle Components". The seller is "buyeasyshop2017" and is located in CA. This item can be shipped to United States.