Description: This board is 4 string 30A 14.8V lithium battery protection board, high current protection board, continuous 30A currrent, with balance circuit Specifications: Working current: 30A Balanced current: 60mA Over current: 60A Temperature range: -30 - +80 Over charge detection voltage: 4.28+ 0.05 V Over charging voltage: 4.095-4.195V Over discharge voltage: 2.550.08 Over charge detection delay time: 0.1s Short circuit detection delay time: 100ms Over current detection delay time: 500 ms Size:56x45x1.2mm Weight:18g Main function: Over charge protection, over discharge protection function, short circuit protection function, over current protection function, balance. Interface definition: Charging port of the plate and the discharge port is the same, both positive and B- connecting battery"-", P- charging port and port on the negative electrode; B-, N-, P- pads are all over the hole, the hole diameter of the pad is 3.5mm; The battery charging detection interface with DC output in the form of needle. Do the same mouth when the N- is not wiring. Package Includes: 1 x 4S 30A 14.8V Protection board Note: 1.Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. 2.Please allow 1-3mm differs due to manual measurement. 3.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same 4. The cable color is random, please take the real one as standard. 5. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.