Brushless Twitching, no throttle

[brainanator]

it could be the batteries. Make sure your ESC is set to NiMH mode (I'm not familiar with that ESC, don't even know if it has a low voltage cutoff).

The constant twitching with no throttle does not sound like a battery issue, but some electronics do weird things with low batts.

The dying when giving it throttle and able to move if very slowly applying throttle do sound like poor/bad batteries.

You know anyone at the hobby shop or something that'd let you try a different battery set or ESC?