Well as everyone says lipos is like night and day vs nimh. Well i just got 4 brand new 2200 2s lipos and currently had 2 1200 nimh. So i put 1 lipo in to use a time chart to compare. 2-1200 nimh vs 1 - 2200 lipo. No comparison the lipo which was 200 mah less total lasted 5 min longer and had more way more bite so i put 2 lipos in paralell and i alsmost got bored before it stopped at about 45 min laterrunning stock gears stock tires and brushed motor. Thanks everyone that told me to get lipos 45 min all 4 charged and ready to roll i use my nimh to clean off the merv with water now and thats it.