The flashlight is mostly 4 ~ 6V small lead electricity, small volume like this flashlight is a small 4v lead electricity, because I repair this gadget for the neighborhood colleagues, the form of the disassembled.
1, the battery is not charged, first of all to check the line by line, confirm the entire charging line, whether the resistance and capacitance burst, whether the four rectifier diodes are normal, whether the two wires on the small battery are corroded and separated, and finally plug in to confirm that the indicator light is normal, the output power is normal, it can prove that the battery is not charged.
2, the battery can not be charged there are two points:
a) The lead electric volume is small, the electrolyte is also less, the resistance and capacitance charging is easy to overcharge, because the circuit is too simple, and there is no protective measures, when the 4V battery is not pulled after full charge, there is always 4.5V upward voltage added to the above, so the battery is easy to overcharge, the harm it brings is that the water vapor can emerge from the plug, the water shortage over time, the dry plate is unable to get electricity.
3, due to the lack of electricity, the battery will be hot and bulging, and the electric pile such as leakage corrosion of copper wire.
4, some flashlight with no electricity you do not add electricity, resulting in loss of electricity, plus overcharge internal positive plate rot depowder, so that the water turbidity leakage, full of electricity to run out the next day.
5, This small lead in deciding whether to scrap? See if it has leakage, if it can not be charged, open the mountain plug and add 2ml distilled water, and then close the plug and fix it to prevent leakage.
6, this poor quality lead flashlight or do not buy, buy or 18650 lithium battery durable. My flashlight only uses the old flashlight shell, put the old battery of the mobile phone in parallel, and put the charging board of the mobile phone in the big shell, as long as a diode is string on the 5V1A, it will not go wrong for a few years, and it is full of charge and release a year to use it as new.
The flashlight battery can not be charged, the reason is simple and simple, complex and complex, summed up there are three reasons!
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First, the charger problem, because the current charging flashlight style, many functions, for the charger is divided into built-in and external, that is, some flashlight charger and flashlight are integrated, this is called built-in, and some charger and flashlight are separate, the charger exists in the form of an individual, this flashlight is called external!
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Second, is the charging interface line problem, this is very easy to understand! We focus on checking the charger interface, flashlight charging positive and negative interface, battery bin positive and negative contacts, to see if the line has corrosion dirt aging welding phenomenon, these problems are very simple, in this do not tremble!