I got a brushless system in my emaxx and I am currently using NIMH and they get the truck around but not super fast. When my emaxx was brushed I had 2, 2s 5000 mah batteries. I went for a drive and FOROT TO UNPLUG THE BATTERIES AFTER THE RUN . then to make things worse it sat like that for 2-3 months. one lipo has no puff but the other one is puffed bad. Ive had them for uhh maybe a year, I checked online and traxxas says "After one year, any Power Cell LiPo battery in any condition can be exchanged for a new equivalent battery for just 50% of the new pack's retail price, no questions asked." I was wondering if anyone has done this and how.