Can be replaced with 18650 lithium battery. The multi-rechargeable torch battery is broken, and other parts are intact. Buying batteries of the same model is hard to come by, and the life is very short and expensive. It is a good way to replace with 18650 lithium battery. This battery, 18 mm in diameter, 65 mm long, has a capacity of 4800 mah, nominally 3.7 volts, and a fully charged 4.2 volts. The battery and the matching charger are not expensive. However, the implementation of replacement must be hands-on. The method steps are as follows:

1. Remove the original charging fork, charging plate and battery together. Only keep the lamp head, switch, torch shell and the connecting line with the lamp head switch.
2. A circular hole is opened at the tail of the flashlight to put the battery.
3. Fix a metal sheet 70 mm away from the new opening as the positive electrode of the new battery, and weld the positive wire of the original battery firmly.
4. Make a rear battery back cover, install a spring, and connect the negative wire of the original battery as the negative electrode of the new battery. Fix with screws or other methods. However, it is convenient to remove the battery and charge it.
After the battery is fully charged, it can be continuously illuminated for more than 60 hours.