2. There are two simple ways to determine the problem of the lithium battery protection board.
3. Method one, without the protection board, directly charge the lithium battery PACK, that is, the lithium battery pack B and B- direct charging, if you can charge, that is, you can ensure that the lithium battery pack is normal without the protection board, but after the protection board is charged, it can not be charged, which shows that the lithium battery protection board is faulty.
4. Method two, replace the protection board, if you replace the new protection board, you can charge, but the old protection board can not be charged, it means that the protection board in the previous lithium battery pack is faulty.
5. If it is the problem of the lithium battery protection board, most of the charging MOS of the protection board is faulty, or the charging fuse is broken by a large current, or the IC of the lithium battery protection board is damaged.
6. Solution: lithium battery protection board failure, resulting in lithium battery pack can not be charged, the most direct solution is to replace a new protection board.
7. If there is no completely new protection board, you can detect the specific fault point of the protection board, such as MOS tube, resistor, capacitor, IC, fuse and other components, detect the specific fault point of the protection board, and then correspondingly replace the components of the protection board, or PCB circuit, it can be solved.
one
Use a clean eraser or other material cleaning tool to gently wipe the metal contacts on the lithium battery and the metal contacts on the mobile phone to help the charging condition and power durability.
two
Will use the automatic shutdown of the old mobile phone lithium battery with plastic wrap firmly wrapped, wrapped as far as possible, inside and outside a total of three layers, to ensure that the battery is in a vacuum. Then, bread three layers of newspaper on the plastic wrap to make the lithium battery completely sealed. Put the frozen layer in the refrigerator,48 hours later, remove the battery, one by one remove the six layers of paper film wrapped outside, the lithium battery does not cause surface expansion or deformation due to freezing. Let it cool for a while, then charge it.
three
Let the lithium battery that is close to being scrapped completely discharge, and then recharge to activate the battery.
Change it, the individual can not be repaired, because its process is not the same, if you want to repair the cost is very large