George, I retired as an EE from NSWC Crane and we used EXPENSIVE accurate electronic voltage sources never batteries of course.
You ask
1) I think A mercury battery would make a good standard reliable voltage. The voltage during discharge remains practically constant at 1.35 volts.
Of course the voltage changes based on the battery State of Charge SOC which changes according to load current and how much stored energy becomes depleted. The voltage sag of my Lithium Iron Phosphate LiFePo4 batteries is MUCH LESS then when I used Lead Acid.
2) What would you consider a reliable voltage source to check a voltmeter's accuracy?
An electronic source NOTTTTTTTTT a battery
The voltage of a Lithium Ion battery versus SOC is pictured below. As long as youre operating in the flat part of the curve such a battery (subject to load) is a decent source for a cheap albeit NOT perfect substitute for an electronic constant voltage source. Check it out
Hope this helps NOTE Im more experienced in AC Power Distribution than electronics so see what any more current ELECTRONIC Engineers have to say, but for now it looks like Lithium is a reasonable source for a fairly steady (subject to load and SOC) near constant voltage source at an affordable cost for your purposes...........
When will you be coming to Florida ????????????????????????
When will you be in the Leesburg and Eustis areas ???????
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