What is the max safe temperature for a nimh battery???

Glad I stumbled onto this thread, because I have the same question. I just bought some new EnerG 4600 7 cell packs for my E-Maxx, and they seem pretty hot compared to what I am used to. I was running it on 6 cell Venom 3000's while I waited (a very LONG wait mind you) for the new batteries, and I don't recall them getting so hot. I've only run the new batteries in the truck once, so before i ruin them, I need to know how high I can go on temps for:

Batteries
Motors
ESC

I can't remember what the readings for each were last night, but I'll run it again tonight and check all three temps. I seem to recall similar temps on my batteries (160F range), a bit higher on batteries, and a bit lower on ESC.

Any suggestions (besides Lipos)?