Welcome to RCU 91374,
IIRC, the CPP comes with the E-Flite EFLC 3110 charger which should work on 1100 or 1300 mAh 3 cell. However E-Flite recommends that you use this charger on E-Flite batteries only. The E-Flite 1200 mAh 3 cell (EFLB 1015) might work well. Check out the link below for more info on this battery.
http://secure.hobbyzone.com/catalog/.../EFLB1015.html
But then again, I would just fly your CPP as is, if it's just a few degrees low at the tail. Just my .02 worth.
Good luck and good flying!