ITEM NAME:4S 16.8V 30A Li-ion Lithium Battery 18650 Charger Protection Board PCB BMS A3U9 4S 16.8V 30A Li-ion Lithium Battery 18650 Charger Protection Board PCB BMS A3U9 Fine workmanship and durable. The integrated protection circuit board for rechargeable lithium 18650 battery. Protection of over-discharge/Over-charge/over-current/over-heat and short circuit. Colour:green Material:ABS 4-Cells 14.8V 30A protection board Charging current: max 30A Balance charge: YES Short-circuit protection: YES Size: 56 x 45 x 3mm Package includes: 1 x 4S 30A Lithium Battery Charger Protection Board Note: Light shooting 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.