Interesting lipo question for the masses...

[kulangflow]

Howdy all. I made an observation and I'm interested in your analysis.

I have two semi-equivalent lipos.

1) TRC 2s 15C 8k (10 cycles old)
2) MA 2s 20C 8k (5 cycles old)

I received both packs within a week of each other and tested them individually for voltage drop over a period of time in a specific vehicle on a specific course. They tested so similar that I couldn't tell one pack from the other. Having heard that the cells come from the same source, that's pretty easy to believe.

Anyway, today I charged them both up, threw them in my E-Revo with an MM/CCBEC/9XL geared 24/65, and ran them down to a custom LVC of 12.8V. Both packs were a tad warm, but nowhere near hot. I lost my temp guage, but they were cool enough that I could've put them on a sleeping person without waking them up.

When I brought them in, this is what I found for the individual cell voltages:

TRC - 3.70, 3.66
MAX - 3.26, 3.44

If these truly were identical cells, then that would be really badly out of balance. Is the TRC pack just not delivering as much capacity or is it holding its voltage much better? The TRC pack does have 5 more cycles on it, could that be why it's performing better?

After charging, this is how much mAh was put back into each pack and the resistance shown by my 0610iDUO:

TRC - 7664mAh - 16mOhms
MAX - 7325mAh - 17mOhms

Anyway, I'm interested in your thoughts and analysis.

Thanks,

Brian