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@Gordon
The battery level is only really a rough pointer - it works from the voltage, which can fluctuate a bit based on temperature or whether there's been some high power draw recently (like radio transmit, a LED lit up, or even the amount of code executed before the call to
getBatteryPercentage).I'm surprised it varies by as much as you're seeing - but if you were using it with the LEDs on, that'd definitely do it.
I guess it's possible that one Puck's battery is full enough that it's still effectively 'above' what would be considered 100%, so you see no changes - while the other one isn't.
Is the 'constant 100%' Puck the same one that was reporting a constant 19 degrees C? Maybe you could check with something like nRF Connect to make sure that it's not your code that's receiving advertisements that has an issue, rather than the Puck itself.