I use my GTB with a 5800, 5.5 and 3.5 and a orion 4800 platinum lipo with nothing else... I have one of these novak 2S lipo smart stop but as I´m very lazy I still have it in the original package!!!!
just be sure you STOP once you notice a performance drop. I can run 8 minutes without worrying. I set up my M11 to warn me at that time.
brushless & GTB are the future...
The Blue Armada: Tamiya TRF415MSXX, Tamiya TA05MS, Tamiya/Xenon TA05
Novak Brushless, Orion/Peak LiPo batteries, 5-cell
Sanwa M11 DSSS, KO Propo Servos