What's the reason for the LED flashlight on?
Unlike a short circuit, it could be a drive board problem. You'd better change it to the seller. The drive board doesn't deserve it
The battery voltage may not be normal, there is an extension bucket, the problem is on the switch, light cup, check the light cup there is no direct contact with LeD solder joints, or bare wire. One by one after investigation, should find problems
You put the switch apart and see there is no metal rust, flash is not caused by the battery protection board, when the voltage drops to a certain extent can play a protective role, you should not say the shift will be bright protective plate problem you have extended barrels without flashlight
