3 ms·
Here [0] is the datasheet for the batteries used. 25 year shelf life is spec'd. I have personally run these cells buried underground, and gotten 4.5 years out
by alnwlsn 2y ago
Here [0] is the datasheet for the batteries used. 25 year shelf life is spec'd.
I have personally run these cells buried underground, and gotten 4.5 years out of 4 of them, though my application is just for fun and likely not as power conservative as an AirTag.
[0] https://data.energizer.com/pdfs/l91.pdf https://data.energizer.com/pdfs/l91.pdf
- michaelmior 2y agoOkay, now I'm really curious what application you have for a device buried underground.
- 01HNNWZ0MV43FF 2y agoOoh what's the application underground?
- alnwlsn 2y agoSo I attend this local annual event that has a time capsule. Each year, we bury one and dig up the one from 5 years ago. This has gone on for several decades, and people are always thinking of interesting things to put in there. I made a little electronics project that is somewhere between "what happens inside a time capsule while it's buried?" and "what if you could wind a watch once and have it still be ticking in 5 years?" I nearly forgot that I made a project page for it: https://hackaday.io/project/160740-low-power-environment-monitor-logger https://hackaday.io/project/160740-low-power-environment-mon... I dug up the first one last year and it had made it to 4.5 years, and I'm actually due to dig up the second one next week.