Should be plenty for watches and IOT devices.
Comment on Coin-sized nuclear 3V battery with 50-year lifespan enters mass production
ExcessShiv@lemmy.dbzer0.com 10 months ago
100 microwatts
This is a very important spec to include…this battery can deliver 0.003mA of power, which is incredibly little.
sugar_in_your_tea@sh.itjust.works 10 months ago
Blue_Morpho@lemmy.world 10 months ago
Google says a Casio watch needs .004mA so not quite enough.
dnick@sh.itjust.works 10 months ago
Did you typo or did he? .03 is significantly bigger than .004
libra00@lemmy.world 10 months ago
0.03 is 7.5x more than 0.004 tho?
Blue_Morpho@lemmy.world 10 months ago
You are right! I didn’t count the 0’s!
sugar_in_your_tea@sh.itjust.works 10 months ago
That’s definitely in the ballpark though. Surely they could for 25% power draw to support a 50 year battery.
mesamunefire@lemmy.world 10 months ago
I wonder how much we really need for a clock (555 eq) to work?
piecat@lemmy.world 10 months ago
2mA minimum, and that’s just q current. It’s gonna be much higher when you’re actually using it for a clock.
I’m sure the casio’s main power sink is the display. I bet the refresh rate could be reduced for better battery life.
cubism_pitta@lemmy.world 10 months ago
A lot more than that. 2ma
Smaller packages may be more efficient.
Analog circuits are weird though
ExcessShiv@lemmy.dbzer0.com 10 months ago
Not really actually…
sugar_in_your_tea@sh.itjust.works 10 months ago
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), 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.
ExcessShiv@lemmy.dbzer0.com 10 months ago
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.
cubism_pitta@lemmy.world 10 months 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
reksas@sopuli.xyz 10 months ago
what kind of things could you power with that amount?
KoboldCoterie@pawb.social 10 months ago
Almost nothing… Maybe some very basic scientific equipment, but they do note that they’d be able to use multiple batteries layered to produce higher output, and that they’re expecting to have a 1 watt version later this year; that’d be far more useful in practice.
frezik@midwest.social 10 months ago
An RTC that you want to leave on its own for a very long time. Like underwater.
GamingChairModel@lemmy.world 10 months ago
0.03mA of current. That times the 3 volts = 0.1 mW of power.
frezik@midwest.social 10 months ago
Technology Connections, we need you to make another video.