nachman4859, I have a Hitec Eclipse 7 and it too has a Tx battery voltage readout on the display. Looks like Hitec went a step further with the Aurora 9 to monitor the Rx end as well. Cool! My Eclipse 7 saved my plane by beeping at me when the battery got low. Thank you Hitec!

BDZ65, I've been looking at those Voltwatch monitors for a while. I'd most likely get one for a complex airplane with higher current draw. But like I said, I cycle my batteries so I'm pretty confident when I go to the field to fly. The Accu Cycle Elite allows you to adjust the discharge rate and minimum voltage it will discharge the battery to. So you can customize it to your airplane's current draw requirements. It's just nice to know how many minutes it takes to deplete your battery to minimum voltage.

I could be wrong but from what I've been reading, the 2.4 systems out there seem to be more voltage sensitive. Rx batteries are critical with those systems as the Rx seems to reboot if the voltage drops below a certain level. 72mhz systems (I feel) are a bit more robust when it comes to low voltage situations.