The explosion-proof flashlight stays on. There should be a problem with the switch circuit contact or circuit board. There is no response when you press the switch. flashlight, it is recommended to return it to the factory for repair.
Explosion-proof flashlights generally use 18650 specification lithium batteries. This type of battery has a disadvantage: if it is not charged for a long time after being discharged, it will be discharged. scrap.
References:
Nowadays, the lithium battery has protection after the power is discharged, that is, it cannot be charged and cannot be used . Those who know a little about electronics can use around 12V and 1~. Current 2A. Use DC power to touch the battery au lithium inside, from positive pole to positive pole and from negative pole to negative pole. It is best to use the current setting of the multimeter. When you touch it, there is a current indication. , indicating that the battery is connected and can be charged. I have used this method to repair the lithium batteries of several card readers. The lithium batteries of the players are the same as those of mobile phones, but there is no undervoltage protection.