lol another dumb question..do you connect your bec to just one of the two batteries? and this will all work with my regular traxxas reciever right?

You usually connect it to both. If not, one battery pack will discharge slightly faster than the other since one is also powering the servos. Just hook the BEC wires to the ESC power wires (observing polarity of course) and you'll be all set.

Just make sure the UBEC input can take whatever battery voltage you are running.

Yes, it will work with any BEC-capable receiver (which most, if not all, are).

Just make sure you're running good gear/diffs. My son just fried a set in his stock Emaxx. It happens evertime I upgrade the batteries.


It's not the bashing I fear, It's the batteries lol

well here's what im debating...either

- Feigao brushless motor 540 8xl w/ RC-Monster Brushless Heatsink/clamp
- Castle Creations Mamba Max ESC
- External BEC/UBEC
- (2) Lipo 5000HV 2S 7.4V Packs


- Neu 1515 2.5d/F Sensorless Brushless Motors w/ RC-Monster Brushless Heatsink/clamp
- Quark Monster Pro 125B Brushless Sensorless Speed Controller w/heatsink
- External BEC/UBEC
- (2) Lipo 5000HV 2S 7.4V Packs


i'd rather do the MM/8xL of course because it's cheaper but im worried that i'll overheat it in arizona and ruin it. if i did go with that would it need a fan?
and are those batteries okay with both set ups? would lipo 8000HV 2S2P 7.4v packs give me more power or speed? or just better run times? should i go with a higher voltage?

Personally, I think you'll be happier with option 2 if you can swing it money-wise. It really is a good combo! Option 1 is good, just not as good.

Brian, your slipping man...You can't use the RC-M heatsink with the Neu.

alright thanks. i'm pretty sure i can swing the extra money, it might just take me a little while longer before i get the setup then. lol. thanks a lot for your help. and are the 5000HV 2S 7.4v packs fine? or should i go with higher voltage or bigger batteries?

lol woops, didnt mean to put that heatsink with the neu..too much copying and pasting. my bad

Lol. Yeah, I guess so! OK, Option 2 looks good sans motor clamp/heatsink. I think I've been at work too long...

But, that's why you're here Squee; to make sure the information given is correct! :)

Yah, I would say the MM/8XL combo is a baseline setup for a MT.

I got a good ESC first with a 7XL, then I'll just upgrade the motor next year, probably a Neu 2.5d w/5s LiPo maybe. I'd run A123's, but 6s for them is just too bulky. Plus I want some more Ah capacity, like 8Ah, maybe more.

What Im having difficulty with is mounting my E-maxx tranny to the Tmaxx classic chassy any advice?