That is very strange indeed to hear that the MM would heat up like that.

I'm sure with more tweaking, and possibly better batteries I could make the MM work for me without any problems. And a UBEC could be the cheapest way to get rid of my heat issues as well. In fact, with a new fan mounted on it, cooler temps outdoors, and higher settings programmed, the MM ESC now seems to be staying well within its normal temp range.

But I'm glad all this has resulted in me buying a whole new ESC for my E-Maxx. Even though it burned a hole in my wallet, I can now supply it with more power (6s lipo - I hope this isn't too much lol), and I can return the MM ESC back to my Rustler from which it was borrowed.

Just an observation from someone who bought Tenergy before knowing any better (my 2 7 cell 4200mah packs are pitiful). I wonder if its just a time issue - as in the cells are sitting somewhere just for far too long? Mine acted like they had been sitting, after cycling at moderate chr/dish rates about a dozen time, they improved an improved and finally stabilized. The disappointment was how low an mah level they stabilized at, my 4200s turned out to be 3000s and they are slipping with less than 20 cycles.

That usually means they are poor quality cells, or the cells are heating up too much. High heat kills NiMHs quickly. If the gearing is set correct (meaning: not too aggressive), hot NiMHs means they have high internal resistance and aren't suitable for the currents required. So, either way, they don't sound all that good for BL IMO - probably fine for stock Titans though...

I don't have any problems with the MM & 7XL on my 15Lbs E-Maxx.... I ran it at the track every race day in the summer..