single cell charge trick

[awol]

What is that trick to charge a single cell with a mobile phone charger, i.e is it as simple as taping the charger+ wire to + and charger- wire to - on that cell only even still connected in the pack? what volts or milliamps should the charger use? and what volt should I take them up to?
I have a cree led 4 cell battery pack which is not charging, they look like the ones with the protecting circuit in the ends I think. All 4 cells read 4.05v and the pack reads 8.1 so am hoping the mobile phone charger trick will spring it into life.

 

[Deleted member 4366]

Pull off the shrink-wrap. I think you'll find that there's a wire off the BMS.

If that's notthe problem, charge them up to 4.2v like you said. Watch that you don't overshoot. They go faster as they approach 4.2v.

 

[Deleted member 4366]

Pull off the shrink-wrap. I think you'll find that there's a wire off the BMS. The BMS is a little PCB hidden under the shrink-wrap.

If that's notthe problem, charge them up to 4.2v like you said. Watch that you don't overshoot. They go faster as they approach 4.2v.

 

[awol]

I've always had trouble with this battery. I removed shrinkwrap to find the small bms looking a bit of a mess with the discharge wires having too much insulation removed and looks like the bare wires were touching. Charged each cell up to 4.19 using the phone charger and the battery works fine without the bms. I am going to solder on a 2s balance lead and charge it with my bc168. If I connect a lipo alarm to the 2s lead, what would I set the volts to alarm at?
Thanks.

 

[Deleted member 4366]

3v pr cell.

 

[awol]

Light battery sorted. Who needs a bms anyway? 2s lipo lead soldered to battery tabs and a bit of heatshrink later. I will need to workout approx use time to discharge down to about 3v. Will use the lipo alarm to start with.
That saved me a few quid as the cells themselves seem OK.