About the dormancy of electronic equipment lithium battery and activating method

People always find the ipad can't work normally. If it is useless to hold the switch of "home" and "power" for a long time, or connect itunes, etc., the power capacity displays low, and can't charge but keep low voltage, the reason is that the battery needs to be activated.

Its symptoms are usually: forcibly boot, flash across the screen, just went out. Connected to the computer, may be identified, but cannot be used.

The building Lord I although battery haven't seen this situation, I didn't open it, but the principle is the same, in this kind remind you feng, out of the question, the way I have here a dead horse move, the maintenance during the warranty period can guarantee to find apple. I was used to repair their own mp3 learned knowledge, where said is right, please correct me.

What is the battery dormancy (accurate panels dormancy) :

Due to the lithium battery the overcharge or over discharge may explosion or other danger, in lithium battery of research and development process, it will join the battery protection board. The circuit board in the joint of battery module, usually by three wiring, it raises the V + and V -, there is a P (used to provide the information such as battery temperature).

The function of the circuit board is 1, when charging, if is filled, a field effect tube will be closed, and led to the current cannot flow.2, when over discharge, short circuit or chronically low voltage, the field effect tube of an electron will be lost, cause a pipe in the field of channel closed. Is certainly not filling in charge in this time, is equal to the battery reverse closed.

Lithium battery itself actually difficult to broken, there will be only the decrease of the capacity, complete a little electricity had lost not to come out, the probability is very small!!!!!Is the control action of protection plate.

Test method:

1, this time using a voltmeter v + and v -, voltage is 2 XV and no basic power output. Lead to equipment led chip only briefly, increasing current, automatic shutdown. If measured with voltmeter, plate on the voltage between p - and b -, there will be a differential pressure in the middle.

2, direct measurement by the battery leads to two power cord, found that the voltage is normal, and is about 3.7 v.

So:

1, when you make your device electronic equipment such as low battery for long, will cause the battery protection board into sleep mode, the rookie would normally think of equipment completely discarded, threw away equipment, alas.

2, what other ways do you use to repair is invalid, because the method has no impact protection board. Protection board will sleep forever.

Method:

Found on the protection board, looking for a marked with p - and b - interface, and then find a wire, connect two endpoints, a second equivalent to short circuit, this time with a voltmeter to measure the pressure difference between two points, you will find that incredibly to 0, your battery was activated now. In fact is so simple, not because of lithium battery charger is not in electricity, just throw away batteries, is so bad. Especially your mp3 can't change the battery, don't throw away the mp3.

Finally, counsels:

Any electronic devices don't keep empty power or low power for a long time! Don't make short circuit on battery directly! Please ensure that your battery is in daily working state, and often charge it.

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