Lipo issues

Yoldume · #1 25-10-2009

just took my buggy out and all was well for about a minute until all the power went and it was coasting around as if i was running a flat nimh pack,

so i walked home and plugged it into my charger and it read 7.96v my charger takes it to 8.4v (is this correct ?) so if it was nearly fully charged whats gone wrong ?

and tbh i think my charger is innacurate because when i fit my lipo monitor readout to it it mainly reads a different of -0.6 to what the charger is telling me

and i also think my lipo cut off in my esc is turd it cuts off at 3.0v per cell and ive checked it after a run and s1 was 3.19v ans s2 was 3.23v

also when i balance theres useually a +/- OF 0.4v

is this all normal or could this be why my pack is acting funny ?

cheers

DCM · #2 25-10-2009

what esc do you have?

Yoldume · #3 25-10-2009

Dont laugh its a orion vortex 70a i bought on the cheap cos my MM had a blue smoke moment a few weeks ago

Marvin · #4 25-10-2009

Check your motor as your batteries sound fine.

The motor's rotor could have broken up (the magnets slipped off the shaft or similar). That would explain the sluggish performance - I've had it happen to me on my 1/8 scale stuff.

Yoldume · #5 25-10-2009

i did think this it cogs on takeoff and give half performance,

there is alot of heat i think somewhere along the setup theres a gearing and resistance issue

lipo is a headache

petemid8 · #6 25-10-2009

just took my buggy out and all was well for about a minute until all the power went and it was coasting around as if i was running a flat nimh pack,

so i walked home and plugged it into my charger and it read 7.96v my charger takes it to 8.4v (is this correct ?) so if it was nearly fully charged whats gone wrong ?

I bought a used lipo off ebay and after a few runs it did exactly what yours did. I've tried to revive it but it looks like one of the 2 cells is goosed so I am going to bin it.

Did you get your lipo new? Is it possible it could have been discharged too much at some point? If it's fully charged and not performing it doesn't look good, hope I'm wrong!

Yoldume · #7 25-10-2009

well i did have an issue with my charger on its third charge when i had a powervut while charging i started the balance charge again and it never said full or finished the charge

the first charge was 40 mins and took 3400mah and the second was 50mins and reached 2550 and i stopped it because it was getting worrying