Quote:
Originally Posted by peetbee
Codman, looking at these calculations could that explain the heated cells you've seen?
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Well Peet, that's pretty much what I was arguing at the begining of my post. From what I had heard/read, the more powerfull motors could pull quite high amps at times, creating quite a strain even on a 20C 3200 mah Lipo (which can sustain 20c x 3.2 amps = 64 amps continuous). The data I saw was claiming quite high current demands at times which could strain a lower capacity battery and create overheating (and possibly even reducing the motors performance). But as I said, I've only read/ heard about this and haven't taken measurements of my own to back the numbers (don't have a logger of my own). Add to this, that most of you have been runing powerfull motors on these packs while they remain cool. This definetly would suggest, as Chris and others pointed out, that the real current strain is well within the capacity of the Trackpower packs 64 amps... So maybe the numbers I was reading about where wrong and there were other reasons for the heating of the packs? I honnestly haven't got a clue!
Maybe the packs I've seen that were warm were poor quality and their C rating was overestimated???
All I know is that my 5500 mah packs, which are only rated to 15C, should be able to dish out 82 amps continuous. And they gave me more than 12 minutes (I stopped counting) of practice using a mamba max 6900kv setup while remaining nice and cool to the touch. So I'm happy! And my Lipos are happy... I'm not sure that having chosen a smaller capacity pack, with the same C rating, would have given me the same thing.
Cheers!
CODMAN