I'm having the same problem with my caldera 10e. I pulled the motor and saw that it was rusty so I replaced that and it is still acting the same. Picking it up the wheels will spin, but when it's on the ground the motor acts like the battery is dead, even though I've tried multiple batteries then used the same batteries on another redcat with zero issues. Neither the stock nimh or a 2000mah Lipo battery works. Please help before I start buying new esc and or programming card for no reason.