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I have the very same. It has a port for a temperature probe that costs about $5. Look up the SkyRC temperature sensor. You can set a cutoff that terminates the charge if the batteries get too hot. The way NiMhs work, that's a very reliable way to halt the charge anyway, they only start to really...

Sounds like the charger missed the end of charge and kept putting current into it. NiMh's are pretty durable fortunately. What kind of charger are you using?

I've capacity tested both individual NiMh cells and packs, and the conditioning effect is definitely a factor. I get something like 50%, 75%, and then 95% capacity from brand new batteries just doing 3 charge / discharge cycles. Many smart chargers build that in as a "refresh" function.

Is the low voltage cutoff intended for lipos still enabled on the ESC? NiMh batteries are more prone to voltage drop under load, and it could be triggering the low voltage protection while the batteries are still mostly full. You'll need to move a jumper on the ESC to set it, or in this case...