What should I do if the battery of the flashlight is broken
If the flashlight is used for a long time, the battery will be broken. In order not to waste it, you can replace the battery with an unused mobile phone battery. The mobile phone battery can be used for a long time and can also be used as waste.
1. Use a screwdriver to disassemble the flashlight first, and use a heated soldering iron to solder off the flashlight's battery.
2. Weld the mobile phone battery on those two wires, (pay attention to the positive and negative electrodes), and also weld two wires of different colors on the battery and lead them out to the flashlight (the two wires are used for charging, remember the different colors corresponding polarity).
3. Put the battery in the flashlight, and put some paper as filling if necessary, so as not to have a gap between the battery and the flashlight, and the dangling is not perfect. Install the screws, and the two outer wires can be glued to the flashlight with tape (note that Don't touch them together) When charging later, you can use the universal charger to charge through the two wires. If you have the conditions, it is best to install the socket.