ORIGINAL: hdoc

Hi guys-- Have a relatively simple problem.

Converted to a Thunder 1320 Lipo for my blade which gives me more steady flying time than I can deal with in my small garage. The stock NiMgH only lasted 8-10 Min before it "died". I'm well into electronics, and do understand the LPo should not go below
9 Volts, Minium, under load, for fear of shortening its life or worse. The ESC in the blade does not have a Lo Voltage cutoff, as does the "usual" ESC's. I designed a simple circuit with a transistor, resistor, Zener diode, & LED (About $3-$4 total), which should shut off the LED at let's say 9.5 V, which is fine for my dimly lit garage, but don't think it'll be worth-while outside !!

Could use a tiny piezeo alert device, but probably too heavy for the blade. Will have a normal ESC on my T-Rex when I get it. Haven't fully perused the ads, and I know such devices exist for Nitro's.

Meantime, I keep, going & going & going and usually end up with about 11V(No Load) when I feel I should quit. Guess I could just time it but as simple as that is, it really isn't.

Any other ideas?

Lloyd