I've got a brushed emaxx with the 16.8v EVX2... twin titans. I'm running Lipo Batteries - Blue Lipo 2s1p 5000mah 20c packs. I've gone about 20minutes before I break something, I am sure my run times are at least 30minutes long. Make sure you get ones that fit your tray and get LVA. I have a hard time figuring why someone would think you would get bored of brushed. Yes my top speed isn't over 35mph... but... that's hella fast already.