I have a Pulse XT 60 with an OS 61 FX and Futaba 7C Fasst system using Futaba 3004 and 3010 analog servos. I am using a 4.8 volt 1000 mah NiCad battery. I have no problem getting 5-6 flights on a single charge with that combination. If you are using a JR/Spectrum 2.4 ghz system go with a 6.0 NiCad or NiMh battery since they seem to be more sensitive to voltage drops.

Bruce