this post was submitted on 04 Apr 2025
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[–] [email protected] 2 points 23 hours ago* (last edited 23 hours ago) (2 children)

Not really actually...not from a single cell at least

[–] [email protected] 3 points 22 hours ago* (last edited 22 hours ago) (1 children)

Why not?

A CR2032 has 235 mAh, which I believe Casio watches use, and their batteries last 5-7 years. So, if we divide that out, that's something like 5-6 microamps (235 mAh / 5 years / 365 years / 24 hours * 1000 = 5.36... microamps). Converting this to watts @ 3v: 15-18 microwatts.

I think that math is correct (this question reaches a similar conclusion), and it leaves some headroom as well.

If you remove RF from the equation (Bluetooth, WiFi, etc) and custom build the chip, you can get some very low power draws. If all you're doing is sampling temps or something, you could send an update periodically over serial or something and fit under 100microwatts or so. You could probably even do RF if you have a large enough cap and send once it charges.

[–] [email protected] 3 points 21 hours ago (1 children)

CR2032s are used in many things that require significantly more power than that, and this cell is absolutely unfit for almost all other uses than barebones old school digital watches.

[–] [email protected] 4 points 20 hours ago

Sure. I'm not saying it's a drop-in replacement, just that it has a number of applications. A simple digital watch or even a bare bones IOT device (with periodic serial signaling) could work well with it. You'd essentially set it up once and you'll forget it's still there many years later.

[–] [email protected] 0 points 22 hours ago

Cell != Battery

Battery = MANY Cells

I am not correcting you just hate the headline.

If you made a battery with 666(667 if we round up) of these you could supply 2ma of power at 3v for 50 years!

I don't have sizes available so assuming 2032 sized batteries... If you stacked them that would be over 2meters tall.

With further advancement these could be viable