ps3 controller

[zerorisers]

A few minutes ago I tried to charge up an old ps3 controller I had but it wouldn'. Do anything. I did what I knew best and took it apart. Checked the battery voltage on the 3.7v li-ion cell. It is at a whopping 27.2 volts! What I want to know is what could have caused this and what could it have messed up on the board?
edit: testing with a 4AH battery I have had laying around. It runs but I do wonder what was wrong with the old battery.

[ElektroQuark]

Did you tried to charge it with the PS3?

[PA0PBZ]

Checked the battery voltage on the 3.7v li-ion cell. It is at a whopping 27.2 volts!

Since there should not be a DC converter in there I find it hard to believe and my guess is that somehow you made a mistake and the real voltage could be 2.72 volts.

[zerorisers]

Checked the battery voltage on the 3.7v li-ion cell. It is at a whopping 27.2 volts!

Since there should not be a DC converter in there I find it hard to believe and my guess is that somehow you made a mistake and the real voltage could be 2.72 volts.

I thought I made I made a mistake at first as-well, so I took it apart, and it seems to me there was an error on the board of the battery. The cell was showing 2.6 volts but on the output of the board it was the 27.2 So I hacked on an old cell I had laying around. Will post pictures in a few minutes. Of what the old cell + board looks like, and what a ghetto job I did. here you can see the photots I have taken that explain the situation. hopefully they are decent enough. https://drive.google.com/folderview?id=0B8rOHVwhGx0ddXAydVA3NFBQdXc&usp=sharing

Did you tried to charge it with the PS3?

Yes I did, using different chargers, even different plugs. Nothing worked. I am able to use it now but uncomfortably as I hate this mains plugin soldering iron that takes 2-3 min to heat up. used solder paste and a lighter.

[Monkeh]

Checked the battery voltage on the 3.7v li-ion cell. It is at a whopping 27.2 volts!

Since there should not be a DC converter in there I find it hard to believe and my guess is that somehow you made a mistake and the real voltage could be 2.72 volts.

I thought I made I made a mistake at first as-well, so I took it apart, and it seems to me there was an error on the board of the battery. The cell was showing 2.6 volts but on the output of the board it was the 27.2 So I hacked on an old cell I had laying around. Will post pictures in a few minutes. Of what the old cell + board looks like, and what a ghetto job I did. here you can see the photots I have taken that explain the situation. hopefully they are decent enough. https://drive.google.com/folderview?id=0B8rOHVwhGx0ddXAydVA3NFBQdXc&usp=sharing

Top right hand of your multimeter display. That says 26.1mV.

Autoranging multimeters strike again.

[zerorisers]

Top right hand of your multimeter display. That says 26.1mV.

Autoranging multimeters strike again.

Oh! Thats my misread! well now I need to Figure out what is truly wrong. I haven't tested the charging circuit yet. I will do that when the battery shows low. Using a 4AH battery rather than the old 300mAH. So it may take a bit longer. Waiting for at lease one bar of the battery symbol to disappear so that I may test. Thank you for pointing that out Monkeh. 

[poot36]

If the battery is below 3 or so volts the protection circuit on it will prevent it from charging.  That is why you are getting a few mV of out of the battery.  Try charging the battery slowly at a low current 50 to 100 mA until it reaches 3 volts or better yet 3.6 volts and then the protection circuit will need to be reset by just charging the battery normally in the controller.

[amyk]

A lion cell with 27.2V would have puffed up and exploded rather spectacularly already, so the more logical explanation is that you should double-check your measurement.