Feature: 1. Built-in high precision voltage detection circuit makes the protection board quick response and protect the battery from damage in time. 2. Overcurrent protection, overcharge protection, overdischarge protection, short circuit protection. 3. The protection board is made with high quality electronic components, stable charge and discharge, with long service life. 4. Wide operating temperature range -40~50℃, low self consumption. 5. Suitable for massager battery pack, LED backup power supply, 12V electronic products, solar street lamp battery pack, monitoring backup power supply, and other products. Specification: Item Type: Lithium Battery Protection Board Overcharge Voltage Range: 4.25-4.35V±0.05V Size: 56 x 45 x 4mm / 2.2 x 1.8 x 0.2inOver-Discharge Voltage Range: 2.3-3.0V±0.05V Upper Limit Working Current: 20-25A (pay attention to heat dissipation) Upper Limit Instantaneous Current: 35-40A Working Temperature: -40~+50°C Storage Temperature: -40~+80 °C Quiescent Current: 30,000 hours Internal Resistance: