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Thanks for the info on the Vyper 2.
Adjusting the sample rate is a good idea--it is only adjustable to every 10 seconds, but it will at least speed up the process.
From what I've read so far, the memory is more like that of a flash drive--not power dependent--so unfortunately removing the battery isn't adequate to clear the memory.
I'd think it's fortunate the memory is not erased on changing battery.
Adam