I have a stock brushed Traxxas Emaxx and I really want more performance at the track. I have lowered my truck put correct tires and sealed them and now I want better batteries. Currently I have 2, 7.4v 3000mah batteries I have been running. They work long enough to get a couple laps in before the race then they are out. I came up with two options to upgrade my batteries. I could either run 8.4v 5000mah batteries and get some performance or get 2, 2s lipos and use a lipo alarm or a cut off. If I go with the lipos, what and how do I use the alarm or cutoff and plug them into my e max. Or get them to work. Where do I put them. And what do I need to do. Pleas help. Thanks