For my marker and reloader b i use recahrgeables....
For the marker i use 9v 800mha
and for the marker i use 6 x 2100 or 2500mha AA's and they work spot on...
The 9 v lats the same as the ones you buy and the aa's last me two trainging sessoions and never let me down...
I bought all mine from 7dayshop.com and never looked back