Protection circuit in Lithium-ion battery.

[equippedbum]

What is a protection circuit and how is it tripped into action with a Lithium-ion battery? What are the steps you take to 'jump start' it?

[lufihengr]

There's usually temperature, over and under voltage protection and also over current protection, so make sure it's at the right voltage and not trying to be drained too fast. Not quite sure what you mean by jump starting it.

[Enderman]

a protection circuit makes sure that the lipo voltage doesnt drop below 2.8v per cell

[equippedbum]

There's usually temperature, over and under voltage protection and also over current protection, so make sure it's at the right voltage and not trying to be drained too fast. Not quite sure what you mean by jump starting it.

I have a Sony NWZX2 mp3 player and a couple of people have suggested that when it goes into this protection mode it's seemingly a dead battery but can be "jumped" with a higher voltage to wake it up...the battery isn't dead, just sleeping? 

[lufihengr]

You should be able to just charge it up if it is just a bit discharged, but if the voltage is 0, the only thing you can do is change the battery.