CR250R

It may be that you are over discharging your packs by running them too long after your Maxx begins to slow down. I found that you shouldn't run an E-Maxx until the batteries are nearly completely discharged. When charged your Maxx will run very strong throughout most of the discharge cycle. As soon as you notice a considerable drop in performance, STOP your Maxx. If you run the vehicle until it barely moves you will permanently damage the packs! Allow the packs to cool for at least 1 hour before charging them again. Check out the Battery Care section on [link=http://www.twinmaxxpacs.com]SPC's[/link] website. "As a pack, always discharge to 0.9 volts per cell, or 3.6 volts total for a 4-cell pack and 5.4 volts total for a 6-cell pack. NEVER run a pack down until your RC car is just barely moving. When discharging with light bulbs, NEVER allow the bulbs to go out. Remove the pack from the discharge bulbs as soon as you notice the bulbs dimming. NEVER dead short your batteries! More packs are killed by over discharging than by over charging. It is better to never discharge your packs after a race than to over discharge them. DO NOT OVER DISCHARGE YOUR PACKS."

I believe this is even more important when running an E-Maxx because a Maxx runs two packs wired in series. I've run 2 [link=http://www.twinmaxxpacs.com]SPC[/link] matched, GP 3300 packs in my Maxx all summer without any problems. They were run several times a week all summer and they still work great. My Maxx can pull endless wheelies in second gear with the stock motors and 19 tooth pinion gears. Hope this helps.