I'm running a 6V, 2300 mAh NiMH battery in my Raptor 50.

Futaba FASST rx
Futaba 9252 x 4
GY401 w/ 9254
Multigov
Align step down gadget to 5.1 for tail servo.

Full charge, the voltmeter reads 6.7 to 6.8 volts under load.

In 4 to 5 flights, my voltmeter is reads close to 6V and I quit until I recharge.

My question is whether or not I am being too conservative. Can I safely fly down to 5 volts?

If I was running a 4.8V battery I would fly until I was near 4.8 volts.