LED rechargeable flashlight can not charge, but plug in power can be bright, what is the reason?
It is estimated that the flashlight comes with rechargeable batteries, aging or poor battery contact
LED rechargeable flashlights can be recharged repeatedly using handheld electronic lighting tools. LED rechargeable flashlight consists of LED light source, shell, rechargeable battery, switch, circuit board and so on.
The battery is broken. The batteries on the LED flashlight are all lead-acid batteries. The charging circuit is a power frequency transformer plus a simple rectifier or a series of plastic capacitor current limiting rectifier. The fatal drawback is that it can not be fully stopped automatically, nor can it be limited by constant current. Several long charging the battery. Charging time is too short, it will also cause battery charge, polar plate sulfide damage. There is no loss detection circuit, the battery power is not automatically cut off the power supply, resulting in damage to the battery discharge. Well, the flashlight is a lithium battery, charger, LED driver circuit, CB and other environmental protection certification. Perfect protection circuit.
