How to repair lithium batteries?

Lithium battery is now very popular application, how to save the cost, let "dead" lithium battery life, I come to exchange experience with you.

There are generally three cases of suspended animation of lithium batteries:

First, the battery can not be charged into the power, the charger, electrical appliances are unable to identify, no voltage electrode.

In the second. Can be charged, the charger, electrical appliances can also be recognized, but only lasted for a few minutes, the power quickly ran out.

Third, it can be charged, and the capacity is quite sufficient, but the voltage of large current discharge drops obviously (specific performance: the shooting mode with the camera can only hold for a few minutes, while the looking back mode can hold for a long time).

1, the battery seems to be "dead", but there is a high probability of survival. The method I've come up with is to charge the battery with a direct current equal to the design voltage of the battery.

2, this kind of "death" to the battery, with original charger is not filling into electricity (no current through), but the use of design is equal to the battery voltage of direct current for the battery will be found to have larger electric current, and the charging current will be reduced slowly, after a few minutes close to zero, this is a good news: the battery voltage is restored to the design level.

At this time to stop charging, and then use an universal meter to measure the battery poles, is there a normal voltage

3. Then, you can charge it with the original charger.

4. In this way, I have repaired quite a few batteries, and many of them can be restored to about half of the designed capacity.

5. In order to completely activate the battery, it is necessary to charge and discharge it several times. The discharge circuit consists of a resistor and a light-emitting diode, which can be used to estimate the state of discharge.

6. In my experience, this worked well for the first type of battery. The latter two cases of the battery, it is difficult to repair, on the Internet to find information, there are few obvious effects. In particular, the third kind of battery "can be charged, and the capacity is quite sufficient, but the large current discharge voltage drop is obvious (specific performance: with the camera shooting mode can only hold for a few minutes, while with the look back mode can hold for a long time)" this kind of battery, it is a pity to discard.

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