Help ! Totally confused

[crusher]

I am on my first scratch build of a Cat 330b 1/14 scale. I am at the stage of buying a battery and charger, the more I search the net the more I am confused. I am looking at a Turnigy ultimate 7500mah 2s2p, 7.4 Lipo. I have four esc's. two for tracks, one for swing and one for pump motor. The pump motor is a 560kv 10 turn motor, with a 90amp brushless esc. A 7.4 volt lipo will give me pump rpm of 4144 with direct drive. Am I looking in the right direction or am I missing something?
Any help would be appreciated.
Thanks
Terry