this post was submitted on 09 Mar 2025
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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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[–] ZILtoid1991@lemmy.world 1 points 6 hours ago

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

"It's over nine million!"

[–] crmsnbleyd@sopuli.xyz 11 points 1 day ago (1 children)

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 day ago (1 children)
[–] crmsnbleyd@sopuli.xyz 3 points 1 day ago (1 children)

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

[–] Alteon@lemmy.world 3 points 1 day ago

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

[–] postnataldrip@lemmy.world 79 points 2 days ago (2 children)

Judging by those USB plugs that hand is enormous

[–] errer@lemmy.world 23 points 2 days ago

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

[–] TomMasz@lemmy.world 18 points 2 days ago

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

Now I'm afraid of that giant hand.

[–] dual_sport_dork@lemmy.world 43 points 2 days ago (1 children)

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

[–] ayyy@sh.itjust.works 1 points 1 day ago

? Are you talking about the lightning connector?

[–] justme@lemmy.dbzer0.com 13 points 1 day ago

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

[–] RejZoR@lemmy.ml 42 points 2 days ago (4 children)

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!

[–] Allero@lemmy.today 31 points 2 days ago (2 children)

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

[–] zurohki@aussie.zone 4 points 17 hours ago (1 children)

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 1 points 11 hours ago

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

[–] Venator@lemmy.nz 2 points 1 day ago

But you get more zeros with Ah 😂

[–] AlecSadler@sh.itjust.works 10 points 1 day 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.

[–] kate@lemmy.uhhoh.com 3 points 1 day ago

I’ve even seen people say “5k mAh”

[–] toynbee@lemmy.world 8 points 2 days ago (3 children)

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

[–] RejZoR@lemmy.ml 6 points 1 day 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 8 points 2 days ago* (last edited 2 days ago) (2 children)

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 7 points 2 days ago (1 children)

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

[–] SmackemWittadic@lemmy.world 5 points 2 days ago (6 children)

I only use parsecs to measure distance

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[–] Ilovethebomb@lemm.ee 1 points 1 day ago

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

Kilo and up is capitalised.

[–] zea_64@lemmy.blahaj.zone 6 points 2 days ago (1 children)

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 4 points 2 days ago

They should.

[–] LodeMike@lemmy.today 50 points 2 days ago (1 children)

Its also 9000000000000000000 MAH at 0.0000000000001V

[–] Sorse@discuss.tchncs.de 11 points 1 day ago* (last edited 1 day ago) (1 children)

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

[–] LodeMike@lemmy.today 12 points 1 day ago

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

[–] DannyBoy@sh.itjust.works 30 points 2 days ago (2 children)

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

[–] Korhaka@sopuli.xyz 15 points 2 days ago

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

[–] ICastFist@programming.dev 9 points 2 days ago

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

[–] kibiz0r@midwest.social 24 points 2 days ago (1 children)

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

IT’S!!!… nine thousand.

[–] psx_crab@lemmy.zip 24 points 2 days ago

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

[–] iii@mander.xyz 14 points 2 days ago (2 children)

Could this power my home for 8 to 10 years?

[–] saltesc@lemmy.world 8 points 2 days ago
  1. It's designed to fail the day after the warranty expires.
[–] skeesx@lemm.ee 3 points 2 days ago* (last edited 2 days ago) (3 children)

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 8 points 2 days 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.

[–] teegus@sh.itjust.works 5 points 2 days ago (1 children)

What, my house used 78 kWh yesterday.

[–] Speculater@lemmy.world 3 points 2 days ago (1 children)

Have you tried not mining bitcoins?

[–] teegus@sh.itjust.works 3 points 2 days ago (1 children)

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

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[–] ryedaft@sh.itjust.works 3 points 2 days ago (2 children)

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 ;)

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[–] DmMacniel@feddit.org 11 points 2 days ago* (last edited 2 days ago) (1 children)

Why does that device have rocket engines?

[–] Lumiluz@slrpnk.net 11 points 2 days ago

That's the heat exhaust. 9 million mAh can get really hot

[–] Speculater@lemmy.world 6 points 2 days ago

Five year warranty is nice.

[–] WolfmanEightySix@piefed.social 3 points 2 days ago (1 children)

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

[–] ICastFist@programming.dev 4 points 2 days ago

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

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