Coin-sized nuclear 3V battery with 50-year lifespan enters mass production
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Should be plenty for watches and IOT devices.
Not really actually...not from a single cell at least
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Google says a Casio watch needs .004mA so not quite enough.
I wonder how much we really need for a clock (555 eq) to work?
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I wonder if it's a compatible replacement for a cr2032
Its not, power output is less than 1/1000th of what a cr2032 can deliver
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Damn. I had to look up the SI prefix scale to make sure i got this right. 100 microwatts would be 0.1 miliwatts. If they truly do end up releasing a 1 watt version of this battery, it would be fucking perfect for meshtastic nodes. Currently, the most common radios used in those nodes transmit at 22 dBm, which is about 150 milliwatts. In client mute mode, the radio by itself transmits one packet every six to eight minutes on average. A 1W battery should constantly run the node without ever having to charge it or, even if not, only have to charge it extremely rarely. I'm not sure how long it takes to actually transmit a packet, but assuming it takes a minute per packet, which I think would be incredibly unlikely, then it would transmit seven times per hour if it transmitted every five minutes and would use about 21.4 milliwatts. As efficient as the NRF-52 chip is, I suspect it is the thing that's taking up most of the power.
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Google says a Casio watch needs .004mA so not quite enough.
That's definitely in the ballpark though. Surely they could cut 25% power draw to support a 50 year battery.
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That was my immediate thought too. Hook it to a super capacitor. The only problem is the self discharge is probably higher than what the nuclear cell can feed.
That's a good point; it becomes less economical if you need multiple of these cells just to counteract the self-discharge. Even so, it's really just a demo of the technology; they do mention they expect to have a 1 watt model later this year.
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searching Walmart website
Not yet.
The real market if this does hit actual shelves is whoever creates adapters for existing products.
Maybe for the 1-watt version they teased, but this one isn't powering consumer-level anything.
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You had me at "nuclear".
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Not really actually...not from a single cell at least
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.
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I wonder how much we really need for a clock (555 eq) to work?
A lot more than that. 2ma
Analog circuits are weird though
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I wonder how much we really need for a clock (555 eq) to work?
https://www.ti.com/lit/gpn/LM555
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.
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Not really actually...not from a single cell at least
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
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Google says a Casio watch needs .004mA so not quite enough.
Did you typo or did he? .03 is significantly bigger than .004
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Google says a Casio watch needs .004mA so not quite enough.
0.03 is 7.5x more than 0.004 tho?
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https://www.ti.com/lit/gpn/LM555
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.
Isnt the refresh rate just 1 Hz?
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0.03 is 7.5x more than 0.004 tho?
You are right! I didn't count the 0's!
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I was concerned about what happens when someone accidentally throws away a device with a fresh battery, but this:
The BV100 harnesses energy from the radioactive decay of its nickel-63 core. The two-micron thick core, sandwiched between two 10-micron thick diamond semiconductors
makes me feel a bit better. That really isn't much radioactive material. Still, it'd be good to see some environmental impact studies done in some worst case scenarios.
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You had me at "nuclear".
