It is applicable to the large single-cell battery pack, cylindrical cell battery pack, and soft-cell battery pack shown in the figure, and can meet the needs of application scenarios. Multiple communication modes + expansion port,CAN, RS485, dual UART communication interfaces, rich expansion applications. Note:The old version of the accessory socket is not suitable for this series of protection boards. Self-developed APP, Smart and easy to use,APP "SMART ", a personal lithium battery manager installed in the mobile phone, all kinds of information are clear at a glance. Connect to the computer host computer through the communication line (UART/RS485/CAN), and you can freely adjust multiple protection values such as overcharge, over-discharge, over-current, temperature, and balance, which is convenient for viewing, reading, and setting protection parameters. Hign-concerned Chemical:None Charging Current:200A Usage Scenario:Power Balance Function:Passive Balanced Handware or Smart:SMART passive balance current:100mA The product appearance and printed words depending on the batch, but this does not affect use. Type:4S 12V Colour:As Shown Material:PCB Package Contents: 1set * power protection board accessories 1 * Chinese and English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.