RE: OFFICIAL MINI E-REVO THREAD!!!
I run my 2s 2100 mah batteries in series all the time when I am outside. I only run it for a few minutes with fresh batteries mostly because I don't have a low voltage cut off. The speed is insane. Its a ton of fun. Just program your ESC for Nimh mode (which eliminates the factory low voltage cut-off) and use your discretion. If you planned on running it that way permanently then buy a separate LVC. My truck has been fine with no issues. Short bursts to speed with gentle throttle application and let off. No continuous runs wide open. I have no idea how fast it goes but it really scoots. Totally worth it in my book. Obviously it is way way way less forgiving and robust with this set up so do it at your own risk.