Well...it's pretty common in the rc world what you are having in one lipo...

Been there to many times, to consider that a problem anymore...

Keep in mind that lipos are 3.7v nominal and 4.2v max charged.
They must be at 3,85v to storage during months, without touching them. Anything less then 3,2v or storing them above 3,90v will start to deteriorate rapidly, either by sweeling or internal resistance increase like mad and no more amps to run...

The mode's charge that we call names are pure numbers for chargers....
li-fe = 3.3v
li-po = 3.7v
li-ion = 3.6v
Pb= 2v (your 1:1 car batery)
Ni-mh = 1.2v
and so many more....

We call names, the charger only see numbers. Allright?

Now when a low charged lipo is on the mix of various cells, the charger's report back that's an error simply because the math is mixed and F"#$"# up.

Try to find the low charged cell individual, very carefull with something like this:
-Multimeter, get the plugs pointed on the balance lead and find the dead one!
-Some kind of pins to charge that dead lipo

Now the charger need to be in ni-mh mode, cause that's a blind mode to charge that not need a specific charge (voltage) to start charging... and carefull stop when reach 4.2v on the lipo. Carefull on that. It takes around a minute or 2 os less for that charging a lipo at 1C. I mean do not pass 4.2v cause the ni-mh never stops charging above 4.2v...it's a blind process... that's why it's dangerous! PEOPLE do not read manuals, or do not know the theory and do S!"#$, even if we tell them to do this way....

Now if she keep the voltage seconds after that ni-mh mode...she's good and then charge her now in lipo mode! If she looses the voltage in 2 to 3 seconds after that charge in ni-mh shes DEAD. Period!






-These are some photos of some of mine that i bring to life, doing this....

I repeat take extra carefull to not touch the red and negative of lipos...it's and instant BANG! They are dangerous!

But with comon sense and extra care, it can de done safelly!

Take notice that those are High End lipos like the ones in photos, and still those are the ones that sometimes a single cell gets below safe voltage... Also don't let pass more then 2 to 3 days after one cell is below safe voltage. She will start to gain memory and die very fast...it should be done as soon as possible...
They will be fine afterwards (in those 2 to 3 days) if not loosing voltage after the ni-mh mode in seconds and charged, obvsiously....

-Revolectrix
-Gens Ace
-ThunderPower

Also anything cheaper, could be equal or worse... it's a lipo thing!! Good or bad, doesn't matter!! They all dye!

Hope that helps...i only share knowlodge, cause when i needed in the earlier days someone did the same thing to me! That's what foruns are all about! Sharing knowlodge, and not to be at mercy of manufacters or shop owners, that only know one thing...and can't pass that line cause it's not their business! :P

Also a lipo alarm, will tell you what cell is below voltage (dead) conected in the right position into the balance leads of the lipo...and always but always charge with balance mode into the charger! Never charge in charge mode...unless your charger do not have a "Balance Charge" mode, but still charges in balance mode with the balance plugs on.