Overcharge and discharge protection to prevent battery overcharge and discharge. Overcurrent protection to prevent abnormal high current from damaging the battery. Balance protection ensures battery voltage balance, helping extend battery life. Stable heat dissipation through aluminum substrate for reliable performance. Safety protection guards against high voltage, reduces MOSFET breakdown risk, and features ultra-low internal resistance MOS. Suitable for most electric tools on the market, including electric bikes, electric tricycles, electric motorcycles, electric vehicles, and power tools. Product appearance and color may vary between batches; this does not affect functionality. Type: 14S 52V 30A 18650 Lithium Battery Protection Board Color: Blue Material: Metal + PCB Package Contents: 1 x Protection Board 1 x Cable Note: Only the items listed are included. Other products are not included. Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3 cm.