I use onboard battery voltage indicators (bar-graph type) in all my ships. They are commercially available from $10-14 and usually sold at hobby shops which carry R/C hardware. It's not worth it making them yourself because the parts cost more than the built up unit. I know this cause I built the first one. To build one, it takes a connector, bar-graph led array, a chip and a couple of resistors ... all available at Radio Shack. But by all means, use one in EVERY ship you have. (Cheap insurance!) d.o.
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