GreenAce92,
The receiver's battery should stay below about 7 - 8 volts, 6 volts is the common voltage for larger receiver batteries. That's also the voltage that most receivers and servos are rated for. That's only talking about voltage, not battery current storage capacity. Higher current value batteries are certainly usable for longer periods of time. Then again batteries with higher current capacities are usually heavier and larger in size. If those things aren't a problem then they make sense. If you can't squeeze them into the hull, well, you see where that's going, right?
- 'Doc