Over voltage range: 4.25-4.35v, +/- 0.05v; Over discharge voltage range: 2.3-3.0v, +/- 0.05vMaximum operating current: 0-25A; Maximum transient current: 34-40AWiring: Strictly according to the diagram wiring: 0V(B )3.7V(B1)7.4V(B2)11.1V(B+), Do not deliberately short circuit. After the line is connected, Need to charge first, then have output.When the battery is connected in series with 3 groups, Please ensure that the voltage of each battery is the same. If not same, please fill in each set of batteries and then use. Do not mix the good battery and the battery.Attention: Do not mix the good battery and poor battery to use. The internal resistance of 3 battery capacity are closer will be better.Scope of application: Lithium batteries with nominal voltages of 3.6V and 3.7V (including 18650, 26650, and polymer lithium batteries)Product size: 46x60x3.4mm (balanced version)Charging voltage: 16.8V - 18.1VContinuous discharge current (upper limit): 40A (if the heat dissipation environment is not good, please reduce the load current)Continuous charging current (upper limit): 20AStandard version: suitable for electric drills with starting current below 60A and power below 100W.Enhanced version: suitable for electric drills with starting current below 80A and power below 135W.Balanced version: suitable for electric drills with starting current below 80A and power below 135W.Note 1: Successfully starting the electric drill requires 4 15C-20C power batteries, or 8 10C-15C power batteries (ordinary 18650 cannot start the electric drill! ! ! ).Note 2: Strictly connect 0V, 4.2V, 8.4V, 12.6V, 16.8V according to the diagram, do not intentionally short-circuit.colour: greenMaterial: PVCPackage Contents:5 x PCB Protection BoardOnly the above package content, other products are not included.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.