Lipo Problems !!

[pistol_pete_2011]

Hi all hope you can help please, new to lipos.

im using a core-rc uac-40 charger and trying to charge a lipo 7.4v 2s losi receiver pack its coming up with ERROR LOW VOLTAGE when trying to charger and will not charge.

Ive seen on another link to charge lipo at very low rate on nimh for 30 seconds to up the rate so it can pick the voltage up, so i tried that and got it from 1.8v to 5.0v in 30 seconds but still saying ERROR when putting it back on lipo settings

Thanks Dave...

[jayst]

need to get above 6.4v m8

[pistol_pete_2011]

will it be ok charging it for that long as it was feathering the voltage. ie not really going up that quick. thanks

[mark christopher]

Originally Posted by pistol_pete_2011

will it be ok charging it for that long as it was feathering the voltage. ie not really going up that quick. thanks

yes may take 5 ten mins just keep watching them and if they swell at all disconect imediatly

[neiloliver]

If the voltage was that low (1.8V for the 2S battery) then the chances are the cells are damaged. Typically damage occurs at <2.0V per cell. If the voltage does not recover to 6.0V then it is RIP LiPo.

N

[pistol_pete_2011]

Many thanks all...ill try it now but if bad cell why would this be as battery is only 2-3 weeks old..

[mark christopher]

Originally Posted by pistol_pete_2011

Many thanks all...ill try it now but if bad cell why would this be as battery is only 2-3 weeks old..

you have let it go flat....... unplug it when not in use, do you have a balancer ? if not get one asap

[bigred5765]

Originally Posted by pistol_pete_2011

Many thanks all...ill try it now but if bad cell why would this be as battery is only 2-3 weeks old..

did you leave the speedo plugged in as that'll damage it

[mark christopher]

Originally Posted by neiloliver

If the voltage was that low (1.8V for the 2S battery) then the chances are the cells are damaged. Typically damage occurs at <2.0V per cell. If the voltage does not recover to 6.0V then it is RIP LiPo.

N

i have recovered many reciever packs that have been totally flat, defo worth a try

[mark christopher]

you need to get it to 6 volts this is the min that the charger will alllow them to drop to (3 volts per cell)
be vary carfull and watch them closely and do not leave them unatended, they should never be allowed to go flat