I sometimes use the voltwatch on my smaller planes but there is A unit called the GEM 2000 that can even tell you more about what your plane is doing just by knowing what that blinking light is telling you. I use them in my more treasured planes. I think it is still being made?? I had A few in my shop and haven't run out of them yet. Something I haven't seen brought up is the make of the switches. I never use those cute little switches that come with your radio or flight pack, I had one go bad on me. I changed over to using the heavy duty JR switch with the charge jack and 16aug wires. On my 60 size and under planes I still only use one battery and switch and have never had one of these fail. I'm still using some 4.8 volt batteries in them but nothing under 1000mah. A lot of what I do still depends on the plane itself. No reason for over kill all the time.