Product Details Feature: 4-string 16.8V 40A lithium battery protection board (with auto recovery function) Compatible with nominal voltages of 3.6V, 3.7V lithium batteries, including 18650, 26650, and polymer lithium batteries. Product Size: Standard/Enhanced Version: 45 * 55 * 3.4mm Balanced Version: 46 * 60 * 3.4mm Product Weight: Standard/Enhanced Version: 9.3g Balanced Version: 10.3g Charging Voltage: 16.8V - 18.1V Continuous Discharge Current (Upper Limit): 40A (reduce load current in poor cooling environments) Continuous Charge Current (Upper Limit): 20A Equalization Version: Suitable for starting current below 80A and power below 135W for drills. Technical Specifications Project Min. Typ. Max. Units Consuming Current 12 18 24 uA Overcharged Protection Voltage 4.2 4.25 4.3 V Balanced Starting Voltage 4.17 4.2 4.23 V Equilibrium Current 95 100 105 mA Balanced Heating Power 1.56 1.72 1.91 W Overcharge Recovery Voltage 4.1 4.15 4.2 V Over-discharge Protection Voltage 2.4 2.5 2.6 V Overvoltage Protection after Over-discharge 2.8 3 3.2 V Over-discharge Recovery Voltage 2.9 3.2 3.3 V Conduction Internal Resistance 2.5 3 3.5 mΩ Overcurrent Protection Current C 70 80 90 A Overcurrent Delay Time 100 150 200 ms Continuous Operating Current 0 40 40 A Continuous Output Power 0 672 672 W Ambient Temperature -40 25 85 °C Troubleshooting Fault Phenomenon Fault Check and Cause The Solution Unable to Charge Measure voltage of 4 groups of batteries. If a battery voltage exceeds 4.25V, overcharge protection activates. Pair the battery pack well and avoid mixing good and bad batteries. Unable to Discharge Measure voltage of 4 groups of batteries. If a battery voltage is lower than 2.7V, over-discharge protection activates. Pair the battery pack well and avoid mixing good and bad batteries. Charging/Discharging Failure Miswiring (e.g., OV, 4.2V, 8.4V, 12.6V, 16.8V) Rewire or replace with a new board (no warranty for human errors). Discharge Protection Check battery pack's discharge capacity or if the load's starting current exceeds overcurrent protection current. Replace battery pack or use protective plate with higher current capacity. Component Soldering Issues No connection between component and PCB pad; or short circuit between component pins. Repair soldering; remove component and re-weld. Electrostatic Breakdown Check MOSFET's G, D, and S poles resistances; zero resistance indicates breakdown. Remove and replace the MOS tube. Package Includes: 1 x Battery Protection Board
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