Quote:
Originally Posted by pb4ugo
I sold a pair of Protek lipos that only had three runs on them. Yes, really three runs in my B44. Before I shipped them, I charged to 7.8 volts (they were 2 cell packs), though I didn't hook up my balancer. The buyer used the first one with success and had the second one swell and his esc (Novak Goat) fry as soon as he turned on the switch.
What would you guys do? Also, what do you guys think could be the cause of the problems? Could over-volting the Goat from overcharging the packs be a likely cause?
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Fried as soon as he turned on the switch? Highly unlikely if he successfully ran the other pack.
A single fully charged lipo cell is 4.20 volts, when overcharged, things begin to get critical at 4.35 volts. Let's look at this. 8.4 volts fully charged, absolute max before swelling, 8.7 volts. Almost ALL ESC's have some tolerance to being over volted. Especially if it's just .5 volts over.
If it were overcharged much more than that, you would have known it. Even without testing.
An ESC failure will damage a Lipo pack. And it not necessarily be the battery's fault. A short inside the ESC, faulting wiring, or a locked motor will produce the same results.
Something smells fishy. If I were you, I would ask alot of questions and get more information.
Knowing what voltage each cell is at, inside the "faulty" pack would help alot also.
Lipo packs that are over-discharged, or over drawn amperage-wise will puff also.
Don't blame yourself, and don't be too quick to blame the Battery. It is most likely, setup related.