1100% brand new and high quality. 2This protection board is suitable for 3 series of polymer lithium battery pack or 18650 lithium battery pack with nominal voltage of 10.8V, 11.1V, 12.6V. 3Protect lithium battery from overcharge, overdischarge, overcurrent and short circuit. 4The circuit board is made with high quality electronic components, stable and reliable. 5No activation function can avoid false trigger protection when used for power applications and Inverter applications with high transient current.