So, did some multimeter testing today... I want to build a circuit that turns on an LED when the battery is at 13.5v, that would mean that I have ten minutes left on the battery, or atleast, in the case of a full on game of LoZ:TP.
Interesting, i wouldnt have managed to think about it, i was born in the digital era, so i just grab a MCU and use its comparator to check voltage...it would use a low current probably about 1 ma at 3.3v or 5v also....in standby
Sorry for the bump, but why not use a battery bar? By the way, the circuit works as I have tested it out on a breadboard and might be perf-boarding it today.