Hi @Charles, we have an application that does nothing more then send a few bytes to the network four times a day with SF12 and max power, that uses a Renata CR2430. I think it is 285 mAhr. We have calculated that it can run for 3 years. If you can use the deep sleep mode on the ATtiny with an external interrupt (like a door contact) you can go even a factor 4 longer!
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