Wow, whats your gearing? I run a MM 6900 which is probably somewhat similar, and with my 6000mah 2s Lipo, I get way more than that. 20-30 mins worth of bashin. My friend has same battery in T4 with 3.5r. Huge difference lipos made. All of his 6 cell packs ran like crap and would draw way too much off the batteries. And he would get like 5 minutes, then he tried my battery and whoa, that thing just tore up his tires and was a different beast altogether. Same thing with my setup, geared 13/90 I've ran it for 45 minutes off roadin, never dropped off in voltage. 17/83 is a good all around gearing, I've clocked it at 46mph, stock gearing 23 tooth, 55mph. but run times are considerably less when doing the speed runs geared that high. Battery has never seen more than 121 degrees. Your ESC might heat up more, yours has a fan tho right?