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Just two years ago my car's 50 kWh battery weighed around 350 kg, now you can get a 45 kWh battery that fits in the palm of your hand!

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[-] postnataldrip@lemmy.world 22 points 1 year ago

Judging by those USB plugs that hand is enormous

[-] errer@lemmy.world 13 points 1 year ago

I’m tired about all these jokes about my giant hand! The first such incident occurred in 1956…

[-] TomMasz@lemmy.world 4 points 1 year ago

At first, I was concerned about that much energy in such a small package.

Now I'm afraid of that giant hand.

[-] LodeMike@lemmy.today 13 points 1 year ago

Its also 9000000000000000000 MAH at 0.0000000000001V

[-] Sorse@discuss.tchncs.de 4 points 1 year ago* (last edited 1 year ago)

This is why mAh shouldn’t be used to measure battery capacity

[-] LodeMike@lemmy.today 9 points 1 year ago

Its actually useful because a battery has a specific operating voltage. It should be required to put both.

[-] RejZoR@lemmy.ml 13 points 1 year ago

I love how we still needlessly use so many zeroes instead of just calling it Ah. Phones with 5000 mAh batteries. Or you know, we could just cal it 5Ah battery. Chinese are even further obsessed with this just adding zeroes because the more zeroes the better!

[-] AlecSadler@sh.itjust.works 9 points 1 year ago

Yeah but Americans are stupid and thought a 1/3lb burger was smaller than a 1/4lb burger. I fully expect they'd think 5Ah is smaller than 1000mAh.

[-] Allero@lemmy.today 8 points 1 year ago

Even better: we could use Wh instead, to not constantly correct for voltage!

[-] zurohki@aussie.zone 5 points 1 year ago

But then you can't inflate the numbers by putting a 3.7 volt battery in a power bank, listing the capacity in amp-hours and implying that you get that many amp-hours at the power bank's 5V output voltage.

[-] Allero@lemmy.today 2 points 1 year ago

Uh-huh I remember getting quite angry when I figured this out back in the day :D

[-] Venator@lemmy.nz 2 points 1 year ago

But you get more zeros with Ah 😂

[-] kate@lemmy.uhhoh.com 3 points 1 year ago

I’ve even seen people say “5k mAh”

[-] toynbee@lemmy.world 3 points 1 year ago

I've wondered in the past why, for example, 1000 kilometers are still referred to as kilometers.

[-] zea_64@lemmy.blahaj.zone 5 points 1 year ago

People don't use megameters enough that you can rely on them knowing what it is nor have an intuition for it even if they technically know.

[-] toynbee@lemmy.world 2 points 1 year ago

They should.

[-] RejZoR@lemmy.ml 3 points 1 year ago

Hehe, nice catch. Technically, under SI standard we could call that 1 megameters... It's mostly we rarely address distances beyond 1000 kilometers in day to day life so kilometers still make some sense. Where under Imperial units, there isn't any unit above mile. For batteries, we don't really use anything less in phones anymore, only smartwatches and earbuds use capacities under 1000.

[-] MadPsyentist@lemmy.nz 2 points 1 year ago* (last edited 1 year ago)

The moon is roughly 385 megameters away, or 0.4 gigameters!

Do we use MM for megameters and mm for millimeters? i think this might start to get confusing. We should probably clarify a few things before some tradie apprentice builds the galaxy's largest bookshelf.

[-] Gurfaild@feddit.org 2 points 1 year ago

To avoid confusion, just use mebimeters (1 Mim = 2^20 m)

[-] SmackemWittadic@lemmy.world 3 points 1 year ago

I only use parsecs to measure distance

[-] zakobjoa@lemmy.world 0 points 1 year ago

Pretty sure parsecs measure time.

[-] SmackemWittadic@lemmy.world 1 points 1 year ago
[-] zakobjoa@lemmy.world 2 points 1 year ago

That was the joke :(

[-] Venator@lemmy.nz 1 points 1 year ago* (last edited 1 year ago)

Maybe it's colloquially short for light-parsecs 😅 Like how people say "gigs" but might be meaning either gigabytes or gigabytes/second or a concert and you work out which from the context.

[-] Ilovethebomb@lemm.ee 1 points 1 year ago

Yes, millimeters, or any other milli measurement (EG milliamps) starts with a lower case.

Kilo and up is capitalised.

[-] dual_sport_dork@lemmy.world 11 points 1 year ago

I see they also invented a new connector standard, Nano-USB Type C.

[-] ayyy@sh.itjust.works 1 points 1 year ago

? Are you talking about the lightning connector?

[-] crmsnbleyd@sopuli.xyz 11 points 1 year ago

I think 45 kWh is more than I use in a month, so I'd love to take this baby to a restaurant or something, "forget" it, bring it back home and profit

[-] Alteon@lemmy.world 2 points 1 year ago
[-] crmsnbleyd@sopuli.xyz 3 points 1 year ago

Like just leave it there for a day or so in an unassuming nook to charge up

[-] Alteon@lemmy.world 3 points 1 year ago

Oh....yeah, I'm a moron. It's still early morning. Makes perfect sense.

[-] justme@lemmy.dbzer0.com 10 points 1 year ago

The picture talks only about stored charges, not energy, maybe it gives only a couple nano volt.

[-] DannyBoy@sh.itjust.works 7 points 1 year ago

You'll want to duck for cover if the battery gets punctured on this one.

[-] Korhaka@sopuli.xyz 7 points 1 year ago

Its only comparable to tens of KGs of TNT, stop worrying about it.

[-] ICastFist@programming.dev 3 points 1 year ago

I don't think you'll have the chance to wait for a puncture before it spontaneously explodes

[-] kibiz0r@midwest.social 5 points 1 year ago

Hey Vegeta, what does the battery say about its Ah level?

IT’S!!!… nine thousand.

[-] psx_crab@lemmy.zip 4 points 1 year ago

The power of the sun, in the palm of my hand!

[-] ZILtoid1991@lemmy.world 2 points 1 year ago

"Vegita, what does the lab equipment say about that battery bank's power level?"

"It's over nine million!"

[-] Speculater@lemmy.world 2 points 1 year ago

Five year warranty is nice.

[-] iii@mander.xyz 2 points 1 year ago

Could this power my home for 8 to 10 years?

[-] skeesx@lemm.ee 2 points 1 year ago* (last edited 1 year ago)

It's impossible to say, but if we assume it's a typical Li-ion battery supplying 3.7V, then:

9 kAh x 3.7 V = 33.3 kWh

So, it would be enough to power the average American house (10 MWh/year) for 1.2 days, or 4 days for a typical European flat (3 MWh/year).

Edited wrong yearly consumption

[-] dual_sport_dork@lemmy.world 2 points 1 year ago

I think your math is off given that just a typical US consumer full sized refrigerator can use ~650 kWh/year and still be considered Energy Star qualified.

[-] ryedaft@sh.itjust.works 1 points 1 year ago

You are off by a factor 1000 on the household power consumption (I think these numbers are without heating or assumes that you don't have electrical heating?). And the voltage could be anything on a magical battery ;)

[-] teegus@sh.itjust.works 1 points 1 year ago

What, my house used 78 kWh yesterday.

[-] Speculater@lemmy.world 1 points 1 year ago

Have you tried not mining bitcoins?

[-] teegus@sh.itjust.works 1 points 1 year ago

Yes but I haven't tried not living in the arctic..

[-] WolfmanEightySix@piefed.social 1 points 1 year ago

Someone buy this so they can tell me how big it is, and how long before it dies for good. Please.

[-] ICastFist@programming.dev 2 points 1 year ago

Smaller than a credit card, didn't last opening the package

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this post was submitted on 09 Mar 2025
104 points (100.0% liked)

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