PM sent, thnx traxxasbasher 4 the clarification...^^^hopefully not the older red hv cap that was making everything go kablooie

Im just now considering doing 4s for my speed runs in my rustler. I have found 2 2s packs that would cost less than a comparable 3s in terms of discharge. It'd be alot more economical for me to purchase 2 2s packs that I can run in my rustler,stampede,xxx-t than to waste alot of money on one 3s pack that will only get used for speed runs. I already have the CCBEC installed,red wire removed and fan on esc for the hell of it. The only difference is Im not running some low kv/ high effecient motor. I'm running a current hoggin 6900. Is there like a certain range of watts that the esc starts not liking? I'm not sure how many amps the 6900 will be pulling, but couple that with the increased voltage, I'm sure it will be hard on the esc. Im not worried about the motor at all, if that goes, oh well, I'll get a 9000 and start over again :P But I am worried about my esc, I wouldn't want to smoke that.

i'd do the double cap mod done on the HV ESCs (2x 25v caps, i think...)

my setup was CC Bec and a 12volt 25mm 12v p/c fan with a 4s2p 6000mah with MM 5700 and it was great! Esc never got hotter than 140 degrees.

Wow, in a TC4? I bet that thing flew. Im thinking about getting two cheaper zippy 2s packs and wiring them in series. I plan on charging/balancing them seperately. Will I have to change my LVC from auto to 12v? Is there any problem with balancing the two packs seperately?

Haha yeah, It flew, but I overheated a cms 5700 with that setup only because I broke my fan that was cooling the motor :C When everything was being cooled, esc and motor never saw anything over 150ish. When I limped the tc4 back in the motor was +/- 300 :neutral::lol:

Nothing will happen if you balance your packs seperately. Thats what I do to mine. I've set the LVC to Auto, and both MM and MMM correctly detect the cell count every single time. I make sure to listen to the number of beeps. The Zippy packs are great, I took them out of storage yesterday after a month or so and they were still balanced, and I ran my E-Revo for a good 20 minutes before calling it a day, and each pack still had 11.2 volts (3s packs in series).

Yep, a full charge is a full charge. I run 2 Maxamps lipos in series and they don't run too terribly out of balance. Being Maxamps lipos they still run imbalanced but there's nothing I can do about that.

Oh cool, thats awesome that the MM will recognize 4s on auto lipo. Thanks for the info!