ORIGINAL: Rodney
VOLTWATCH, VOLTWATCH, VOLTWATCH. Makes checking before and after each flight almost a certainty plus will catch lots of other problems a loaded voltmeter will not.
It's not really related but I use one of these in an lst2, I installed it after being hit with the truck wide open! I had a rec. pack go bad from sitting in the on position, but even after charging it would read as charged on a DMM but would die moments into the run. I installed one of these volt gauges after the switch so if anything is going bad it will show up in the led light bar, I've ran this setup since last summer and have not had another runaway since!