tenergy batts too hot

[jediguru]

has anyone had problems with tenergy 4200 8.4 nimh batteries? I was running them in my emaxx and one cell on one of the batteries got real hot and melted the wrapping off. It still operated but it would get really hot. Then today the other battery started doing the same thing. Again one cell got real hot(180+). Is the pack bad? Or maybe just the one cell? Any input would be great.

setup
stock emaxx3905 on 14nimh, hot battery first time

emaxx3905 with feigao 10XL w/ MM on 14nimh 22/58, second hot battery