Open the case and remove the battery, buy a set of batteries according to the size and specifications of the original battery (be sure to specify that you need a power bank , because ordinary batteries cannot discharge). with high current), then put it back and solder the connections. Just glue the shell back on.
First open the outer packaging of the hand drill lithium battery and carefully remove the original lithium battery. Then find four lithium batteries of the same model and test the internal resistance of the lithium. Battery with an internal resistance meter. If you simply do the same, use a spot welder to weld the nickel strip, and then carefully weld the lithium battery protection plate according to the original extension, otherwise the lithium battery will break. be burned. Then push it back onto the original shellborn.