Before I start really disassembling the battery, this is what I found after tearing the first part of the shrinkwrap off. Are these the pins you are talking about (there's 11 of them)
Troubleshooting dead battery?
- Thread starter Chris Maluszynski
- Start date
Yes, that them, start one end, hopefully one wire is black, work along the pins, leaving neg. probe in the first pin, noting down the voltages. It should climb approx. 3v each time. Post your results.
10 pins will be v+ one for each cell and one end will be gnd/v-.
Probe the two end ones for polarity to see which one is v-.
Two ways of checking the 10 cells with probing accumaltive voltage reading or individual cell voltage reading.
For accumulative voltage reading stick Black probe in v- and just measure each of the other pins witht the Red probe.
For individual cell reading, Black probe /v- and Red probe in adjacent v+ for cell #1 reading.
For next cell #2 reading move both probes to the next adjacent cell (one at a time)until you have done this ten times, so Black probe always goes in to where the Red probe has just been.
Probe the two end ones for polarity to see which one is v-.
Two ways of checking the 10 cells with probing accumaltive voltage reading or individual cell voltage reading.
For accumulative voltage reading stick Black probe in v- and just measure each of the other pins witht the Red probe.
For individual cell reading, Black probe /v- and Red probe in adjacent v+ for cell #1 reading.
For next cell #2 reading move both probes to the next adjacent cell (one at a time)until you have done this ten times, so Black probe always goes in to where the Red probe has just been.
Ok, here goes. Presumably some bad news. Measured between the first pin and successive:
1-
2. 4.10V
3. 4.58V
4. 5.26V
5. 9.36V
6. 13.47V
7. 17.57V
8. 21.7V
9. 25.8V
10. 29.9V
11. 33.5V
Looks like trouble on pins 3 and 4?
1-
2. 4.10V
3. 4.58V
4. 5.26V
5. 9.36V
6. 13.47V
7. 17.57V
8. 21.7V
9. 25.8V
10. 29.9V
11. 33.5V
Looks like trouble on pins 3 and 4?
Yes, you deff. have a couple of poorly(read dead) cells there, but now you know how it's done. Time gentleman please
You might get some life out of it if you charge the two low cells to around 4.1v the same as the others. Also, the last one needs charging. Use a 1S lipo charger. This one will do it, though a bit slow. If you pull the pins out of the connector, you can plug them straight in. You must put them in the right way round otherwise it will instantly blow.
https://www.ebay.co.uk/itm/1S-Lipo-Lithium-Battery-USB-Cable-Charger-Red-JST-Female-Head-3-7V-Output-UK/332997732976?hash=item4d88362a70:m:mbLip25JQtup3sEzwKwA9jg&redirect=mobile
https://www.ebay.co.uk/itm/1S-Lipo-Lithium-Battery-USB-Cable-Charger-Red-JST-Female-Head-3-7V-Output-UK/332997732976?hash=item4d88362a70:m:mbLip25JQtup3sEzwKwA9jg&redirect=mobile
Hey, thanks for this. I am just revisiting this thread.
Found this charger at home - would it work too?
Looks like it'll get the low cells up to 3.6v, which is a start, but you need to get the battery completely balanced before you can get any range out of it. Once you have the low cells at 3.6v, it will accept charging, but only until one of the high cells reaches 4.2V. After that, you have to drain the high ones down to match the low ones.
Ok, so I would connect the v+ on the charger to the pin with the low voltage and the v- on the charger to the v- pin on the end?
Yes, that is correct.
The charger is for 3.6v if you, did it as in #30 then the charger would read too higher voltage and not do anything.
I just checked the voltage on the charger to make sure it was the right polarity. But it shows 6.3V! That can't be right? Or? SHouldn't it be showing 3.6V as indicated on the label? Or is charge voltage higher than the charge it can deliver?
You can get a wrong voltage reading if the meter's battery is low or nearly had it.
If the charger voltage output is higher it doesn't matter as long as the charge rate is low, you just have to make sure the cell you charge doesn't over charge so check it with the meter every 10mins or so.
If I ever need to do any single cell charging I use a 5v cell phone charge and just carefully monitor the cell voltage.
If the charger voltage output is higher it doesn't matter as long as the charge rate is low, you just have to make sure the cell you charge doesn't over charge so check it with the meter every 10mins or so.
If I ever need to do any single cell charging I use a 5v cell phone charge and just carefully monitor the cell voltage.
Some of these chargers pulse a higher voltage and switch off when they reach the designated voltage. The battery will dampen the pulses to an average, so it's not a problem, but you should monitor the charging to make sure it doesn’t go over, just in case.
Been trying the low cells now for a while, and nothing seems to be happening. Not sure if it's the charger, the connection or if they simply don't accept any charge at all. How long should it take to see any difference in voltage you think? Bear in mind the charger is 250mA according to the label.