no.its full charge is 8.4 its in lipo mode now you will be ok untill low voltage on esc ingages.. a nimh uses voltage way faster than a lipo .
http://www.tjinguytech.com/charging-how-tos
dont run a 3 cell on that 4000kv... you will have more problems if you do and it wont be lvc cutoff ...get a 2 cell lipo charge corretly.store at storage voltage .....3 cells is to much voltage for that 4000kv motor.