SaiDian 2Pcs 4S 40A 16.8V Li-ion Lithium Battery 18650 Charger PCB Protection Board Circuit Balance Charging Module for Drill Motor(Enhanced)

Weigh:9g
Size: About 45x55x3.4mm/1.8x2.2x0.13"

Tips:
The successful start of the drill requires four 10C-20C power battery, or eight 5C-10C power battery,for 0V and 12.6V connection lines, use copper wires of more than 3 square millimeters (do not use nickel sheets)
Strictly according to wiring guide 0V, 4.2V, 8.4V, 12.6V, 16.8V, do not touch any components on the board while soldering the wire to avoid short circuit.
When soldering the battery for the first time or when charging, as long as a single battery exceeds 4.2V, the "430" resistor will heat up and discharge (stopping heating when discharged to 4.19V or so). If the "430" resistor is severely heated , please check if the wrong line is connected.
When connecting 4 groups of batteries in series, please ensure that the voltage of each group of batteries is the same. If they are different, please charge each group of batteries individually and reconnect it in series. In the discharge test, the battery with a faster voltage drop is a poor battery.

Note:
Manual measurement, with small error. Please check size in detail before purchase.
Real colors may slightly differ from the pictures, as it depends on specific monitor settings and light brightness.

We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution.

Package Includes:2Pcs