Charger issues, advice please

[Body Paint]

I have one of the Quad Pro chargers, there are lots of rebranded versions availabe.

The problem I have is this. When charging, the voltage readout on the screen very quickly ( within a few minutes) goes up to max voltage, 8.4v for a 2 cell lipo. When checked with a volt meter the lipo is what you would expect a flat pack to be 7.5 volts ish.

When the charger starts to read 8.4v the charge amps begins to drop, the amps keep dropping till they get to .1 and eventually will finish charging. But this can typically take well over an hour to put 2000mah into a 5a lipo at 1C sometimes over 2 hours on balance charge.

The charger never over charges the lipo, when lipo is charged it is never over 8.35 volts.

Now I am only using a cheap 10amp power supply, but I get the same problem whether I charge 1 or 3 packs.

Any ideas? Anyone had similar problems?

[mark christopher]

That's how lipo charge works, constant volts, it should get to 8.4 then drop the amps. Re time I'm not sure, what watts is the charger?

[Body Paint]

So the charger should read 8.4 even though the battery is still flat?

Charger specs say 50w

http://www.elitemodelsonline.co.uk/P...s/9253-/LIPRO-

[magictorch]

I would first try a different lipo, if no luck then i would send the charger in for repair, what you have described is not normal and possibly dangerous. You could always use this as an excuse to treat yourself to a new charger

[Body Paint]

I have lots of lipos, old and new and all the same.

Charger has been the same since 3 weeks old and I've had it a year. I check the lipos very regularly after they are charged and they are never over 8.35v

Might get it off to mr Bailey for a once over if no-one has any ideas

[jaysllim]

I got the same as u but the etronix one nd now u say this im guna grt mine out nd check wa tha is doing,but I think im using a hefty power pack,coz thats the ailver case I varry around with the cd player built into it nd I can listen to music nd still charge with no notacble drop but then again iv never really checked lol.but as ov tomoz I will.i no wa I said is prob ovno help mate but I said it n e way lol

[Chequered Flag Racing]

Originally Posted by Body Paint

Any ideas? Anyone had similar problems?

Just had similar with a 1s 3.7v LiPo on a Core UDC-50

Charger said voltage high. Ran cell in car for 8 minutes. Recharged and volts went to 4.2v, amps drop, but charged to 2000mah. Another 8m run. Back on charge took in slighty more mah's

I'll check it later in the day as it's now rested for 36hrs

Checked the cell on another charger to prove volts and my charger and it came back at high volts.

I'm thinking this cell may have over volted due to not using a balance lead as I was charging to 1s 12th cells which would have differing capacities even though the cells are 6000mah. I did stop the charger at 8.4v when I noticed the amps start to drop.

[mark christopher]

Originally Posted by Chequered Flag Racing

Just had similar with a 1s 3.7v LiPo on a Core UDC-50

Charger said voltage high. Ran cell in car for 8 minutes. Recharged and volts went to 4.2v, amps drop, but charged to 2000mah. Another 8m run. Back on charge took in slighty more mah's

I'll check it later in the day as it's now rested for 36hrs

Checked the cell on another charger to prove volts and my charger and it came back at high volts.

I'm thinking this cell may have over volted due to not using a balance lead as I was charging to 1s 12th cells which would have differing capacities even though the cells are 6000mah. I did stop the charger at 8.4v when I noticed the amps start to drop.

you can not balance a 1s cell?

[Chequered Flag Racing]

Originally Posted by mark christopher

you can not balance a 1s cell?

I can

but that's another topic

back on topic please