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!

top 45 comments
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[–] [email protected] 3 points 5 hours ago

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

[–] dual_sport_dork 33 points 12 hours ago

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

[–] [email protected] 24 points 13 hours ago (2 children)

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

[–] [email protected] 9 points 12 hours ago

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

[–] [email protected] 6 points 12 hours ago

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

[–] [email protected] 19 points 12 hours ago (1 children)

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

IT’S!!!… nine thousand.

[–] [email protected] 30 points 14 hours ago (3 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!

[–] [email protected] 24 points 12 hours ago

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

[–] [email protected] 1 points 6 hours 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.

[–] toynbee 6 points 12 hours ago (3 children)

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

[–] [email protected] 4 points 8 hours 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.

[–] [email protected] 6 points 11 hours ago* (last edited 11 hours ago) (1 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.

[–] [email protected] 7 points 11 hours ago (1 children)

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

[–] SmackemWittadic 2 points 10 hours ago (1 children)

I only use parsecs to measure distance

[–] zakobjoa 1 points 10 hours ago (1 children)

Pretty sure parsecs measure time.

[–] SmackemWittadic 1 points 9 hours ago (1 children)
[–] zakobjoa 2 points 9 hours ago (1 children)
[–] SmackemWittadic 1 points 8 hours ago* (last edited 8 hours ago) (1 children)

Ah sorry bud, that wooshed over me since I am falling asleep ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯

I am in fact, dumber than a sentient piece of cheese

[–] roguetrick 1 points 7 hours ago

I've never met a sentient piece of cheese, how smart are they?

[–] [email protected] 2 points 12 hours 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 3 points 12 hours ago

They should.

[–] postnataldrip 59 points 16 hours ago (2 children)

Judging by those USB plugs that hand is enormous

[–] errer 8 points 11 hours ago

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

[–] TomMasz 13 points 15 hours ago

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

Now I'm afraid of that giant hand.

[–] [email protected] 38 points 16 hours ago (1 children)

Its also 9000000000000000000 MAH at 0.0000000000001V

[–] [email protected] 7 points 8 hours ago* (last edited 8 hours ago) (1 children)

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

[–] [email protected] 4 points 7 hours ago

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

[–] [email protected] 21 points 15 hours ago

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

[–] [email protected] 11 points 15 hours ago* (last edited 15 hours ago) (1 children)

Why does that device have rocket engines?

[–] [email protected] 10 points 14 hours ago

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

[–] [email protected] 12 points 17 hours ago (2 children)

Could this power my home for 8 to 10 years?

[–] saltesc 8 points 16 hours ago
  1. It's designed to fail the day after the warranty expires.
[–] [email protected] 1 points 13 hours ago* (last edited 10 hours 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 6 points 12 hours 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.

[–] [email protected] 4 points 12 hours ago (1 children)

What, my house used 78 kWh yesterday.

[–] Speculater 2 points 12 hours ago (1 children)

Have you tried not mining bitcoins?

[–] [email protected] 2 points 11 hours ago (1 children)

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

[–] [email protected] 2 points 11 hours ago

you should get some asics and mergemine while you heat your home

[–] [email protected] 2 points 11 hours ago (1 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 ;)

[–] [email protected] 1 points 11 hours ago (1 children)

Whoops, you're right the values for yearly cosumption should be x1000, or in MWh. So, it's just enough for a day or two.

[–] [email protected] 1 points 10 hours ago

That fits with people's stories of running their homes from their car battery for ~3 days during power outs.

[–] Speculater 4 points 13 hours ago

Five year warranty is nice.

[–] [email protected] 2 points 14 hours ago (1 children)

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

[–] [email protected] 2 points 12 hours ago

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