What would cause the battery to report a different voltage every 15 seconds?

Looking at the battery status in the phone app, every 15 seconds the battery voltage and percentage full changed, 30% to 100% and random values in between?

What could cause this?

it sounds like a loose connection or something similar?

What type of inverter and battery do you have?

Have you ever had the battery replaced at all? There used to be an amusing glitch where if the old one got repaired and sent out to another user you got both yours and theirs battey readings - which looked a bit like it was jumping up and down.

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The battery is 2.5 years old and was new when purchased.
I think it needs calibration but every time I try to initiate it, it fails.

David