Battery Puffing Issue

[Jamey]

Tlandauer is right. You didn't run the battery to long as I suggested but you instead pulled amps faster than it was able to supply, at least at the end of run. So resting voltage is okay but the voltage under load was too low for too long. You may be able to get away with using that battery (if it is in fact still in good working order) but at a much smaller portion of the capacity. In other words if you stopped at 3.8v you may have been okay. I personally run 60C and still only use 50-60% just for a piece of mind

[Pathfinder]

So I got to run yesterday. I checked it once a minute and timed my run to a 4 minute max. Little heat and no puffing at the 3rd minute, at the 4th time back in the water I hit some weeds at speed and the boat decided it would rather go swimming. I got the boat back and there still wasn't any puffing in the battery, but my receiver is toast. It was under too long. Any rate, all part of the business I guess. Thanks for all of the advice guys, I really appreciate the help. I learned a lot!

[dmitry100]

Have you tried covering the receiver board with some marine epoxy or anything like that?

[785boats]

It's a bit concerning that you only put back 3,247mah into the pack because for all intents & purposes the pack was almost dead flat 3.6V/cell is only 5% remaining & that's after the pack had recovered some voltage. I you had tested the pack immediately after the run you would have been looking at 0 capacity left, & a lower voltage.
So the pack has, as Tim mentioned it would in post #13, lost a lot of capacity. About 1800mah. So you won't be able to run it as long at if it were still a 5000mah pack.
It may recover some capacity over the next few cycles but not much.
Here's a table that shows voltage/ capacity for future reference.