this post was submitted on 02 Apr 2025

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Mildly Infuriating

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308

Trying to buy anything with USB-C Power Delivery: Listing a million devices instead of the output voltages / amperage (dubvee.org)

submitted 3 days ago* (last edited 3 days ago) by ptz@dubvee.org to c/mildlyinfuriating@lemmy.world

56 comments fedilink hide all child comments

Instead of the sane approach of specifying 5, 9, 12, 15, and/or 20 volts and the amperages, products insist on listing every model of device in existence instead.

Most will do 12V, but I always want to make sure it'll power my laptop (20V) as well.

A big thank you to reviewers who post images of the actual products where it shows the relevant info in one short line on the labels:

e.g. PD Output: 5V=3A, 9V=3A, 12V=3A, 15V=3A, 20V=3A

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[–] f4f4f4f4f4f4f4f4@sopuli.xyz 1 points 12 hours ago

To be faaaaaaair... The devices no longer have the DC voltage and current ratings listed on them like they used to.

[–] tiramichu@lemm.ee 94 points 3 days ago (1 children)

This is mostly the fault of what people search for.

90% of your average buyers don't go on shopping sites and search "20W USB-C PD Charger" they go on and search "Samsung S22 charger" or whatever they've got.

Sellers are incentivised to design the listings around that, or they simply won't get the clicks.

[–] ptz@dubvee.org 76 points 3 days ago (1 children)

Yeah, I get the "SEO" aspect of it, but they could at least include the actual specs somewhere.

[–] GrumpyDuckling@sh.itjust.works 9 points 3 days ago (1 children)

I always do just so other people can search for it later. There's sellers of aftermerket chargers that will blur out the specs so you can't just find a cheaper one.

[–] ptz@dubvee.org 2 points 3 days ago

🫡

[–] LarmyOfLone@lemm.ee 13 points 3 days ago* (last edited 3 days ago) (1 children)

Basically amps is capped at 5 ampere, so it's watts / 5. So for 20V you need 100 watt. USB Power Delivery specification revision 2.0 does up to 240W with 48V which is pretty awesome.

I'd love a 20V battery for power tools that just has a USB3 plug instead of special chargers.

[–] f4f4f4f4f4f4f4f4@sopuli.xyz 1 points 12 hours ago

I'd love a 20V battery for power tools that just has a USB3 plug instead of special chargers.

Good news, I'm starting to see products like this on the market!

[–] walden@sub.wetshaving.social 18 points 3 days ago (4 children)

I could be wrong, but I just did some quick research and it looks like the PD spec always supports all of those voltages. I also did a reverse image search of the image you posted, and it's some no-name brand from Amazon. Don't buy no-name brands from Amazon. Stick to Anker.

[–] naticus@lemmy.world 15 points 3 days ago (2 children)

Moved to UGreen after Anker's nonsense with their cameras. Used Anker for many years up to that point though. Not that there should ever be security issues on a charger, but I'm happy with UGreen.

[–] officermike@lemmy.world 6 points 3 days ago

Same. And I've bought many UGreen chargers and cables since that whole ordeal. Since then I've seen some Anker chargers, batteries, and desk power strips that looked really appealing and that I would've bought if I wasn't avoiding them.

[–] walden@sub.wetshaving.social 3 points 3 days ago (1 children)

Good to know. I had heard Anker did some shady stuff but never caught wind of a good replacement. The phone charger scene is obscene as seen by OP, and and I would rather buy from Anker than buy garbage.

[–] naticus@lemmy.world 3 points 3 days ago

Oh definitely. If my choices are no-name garbage or Anker, it'll always be Anker. You'd be better off with nothing than that shit.

[–] ptz@dubvee.org 11 points 3 days ago* (last edited 3 days ago) (3 children)

Looks like revision 2 of the PD spec requires all of those voltages, but in revision 1 it doesn't require 20v. And if they're not listing the voltages, they're prob not listing the PD spec revision it adheres to.

RavPower was my jam before they got booted from Amazon, but yeah, I stick to Ankler for the most part (unless I just need a dumb power bank to dump solar into that'll charge my better power banks - e.g. the 50,000 mAh behemoth I've got charging outside right now).

The reason I had to stray here is because I'm looking for a 12v -> USB PD adapter I can hook to a 12V solar panel. Not the "cigarette lighter" kind, but the kind you hard wire. No-name is about all you can really buy unless I want to crack open an Ankler or fuss with a cigarette lighter-style adapter (those are a PITA sometimes lol).

[–] walden@sub.wetshaving.social 3 points 3 days ago* (last edited 3 days ago) (4 children)

I'm having trouble imagining what you're setting out to accomplish. 12v solar panels are higher than 12v. This one gets to 18v, for example. You need a solar charge controller to convert it to 12v, and then you'd need something like this to convert it to 5v to charge your battery bank. Whether your battery bank will "take" 12v without electronics to tell it to is beyond the scope of my knowledge, but AFAIK 5v is universally accepted.

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[–] Smokeydope@lemmy.world 3 points 3 days ago* (last edited 3 days ago) (5 children)

12v solar -> USB PD adapter

Is this by chance closer to what you are looking for? input voltage range is 13V-27V, output is usbc-pd 18w or 12v-1.5A the DC out is a bit higher.

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[–] fuckwit_mcbumcrumble@lemmy.dbzer0.com 2 points 3 days ago

USB PD 1.0 is irredenta in 2025. 2.0 is basically irrevent outside of old device still on sale.

If the charger does 60 watts or greater it's going to be 20v. https://www.renesas.com/sites/default/files/media/images/normative-voltage-source-pdp-rating.png

Everything made in the past like 4 years is 3.0. Ideally you shouldn't buy anything that isn't PPS (programmable power supply) because it makes charging a LOT more efficient.

But good luck finding a 12v adapter, they're very hit or miss on supporting it since 12v is optional now and not a lot of things support it.

[–] Tahl_eN@lemmy.world 3 points 3 days ago

My understanding is that Samsung uses an odd standard that means they can't quick charge from Anker devices. That was at least true a few years back. Would be great to know if that's changed.

[–] Voyajer@lemmy.world 3 points 3 days ago

12v is optional from PD2.0 onward

[–] CanadaPlus@lemmy.sdf.org 13 points 3 days ago* (last edited 3 days ago)

Citizen, desist using science words immediately, and get back to consuming ContentSlop™ as appropriate for your clearance level.

Okay, maybe that's a bit spicy, but getting googlebombed by basic stuff when I'm looking for something technical does feel like this. Duckduckgo will even replace your search with a totally different search sometimes!

[–] viking@infosec.pub 12 points 3 days ago

Frustrates me as well, but the reason is quite simple that people search for "$device cable", and sellers need to list all of them so the search engine of choice lands the user there.

They should still list the specs though.

[–] f4f4f4f4f4f4f4f4@sopuli.xyz 8 points 3 days ago (4 children)

For some reason, "amperage" mildly infuriates me. It's current.

Voltage equals amperage times ohmage.

[–] aegis_sum@lemmy.world 7 points 3 days ago (2 children)

Ohmage? You mean resistance?

[–] f4f4f4f4f4f4f4f4@sopuli.xyz 1 points 12 hours ago* (last edited 12 hours ago)

That's the joke. Edit: oops, you got the message already! 😂

[–] CrayonRosary@lemmy.world 9 points 3 days ago* (last edited 3 days ago) (1 children)

That was the joke. They are making everything in the equation end in -age. Because "amperage" bugs them.

Volt + age
Amper(e) + age
Ohm + age

[–] TheEntity@lemmy.world 9 points 3 days ago

In other words, ohmage is an homage to amperage.

[–] CrayonRosary@lemmy.world 4 points 3 days ago (1 children)

Then why doesn't "voltage" bug you? It's the same sort of word: unit + "age".

To fully satisfy you, it should be:

electrical potential difference = current * resistance.

[–] f4f4f4f4f4f4f4f4@sopuli.xyz 2 points 12 hours ago (1 children)

Potential or electromotive force. "Voltage" is long accepted. The only use of "amperage" you'll find in The Art of Electronics is in the index: Amperage, see current. Ampère called current "intensité du courant", hence I in V = I × R.

I don't know why it bugs me. This is Mildly Infuriating... The place for nitpicking! 😅

[–] CrayonRosary@lemmy.world 2 points 12 hours ago* (last edited 12 hours ago)

Agreed, and thanks for the history lesson!

[–] Revan343@lemmy.ca 4 points 3 days ago (7 children)

Why is 'voltage' fine then?

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[–] Tehdastehdas@lemmy.world 2 points 3 days ago

I raise you "cubic capacity" meaning volume.

[–] capuccino@lemmy.world 7 points 3 days ago

Lmao, I got this same problem looking for webcams. It has "1080p" in the title, but it doesn't says how much MP has, so I can't buy a proper webcam because I can get a shitty ass camera with 1080p but with a shitty image quality.

[–] trxxruraxvr@lemmy.world 4 points 3 days ago (2 children)

Also it should be 'any device'

[–] TheEntity@lemmy.world 14 points 3 days ago

Any device made according to the spec. So mostly "not Nintendo Switch".

[–] ptz@dubvee.org 6 points 3 days ago* (last edited 3 days ago) (4 children)

Should be, but not all of them support 20V. I'm less concerned with the wattage (I usually buy a minimum of 20W) since my laptop is designed for 45W but is smart enough to throttle and not charge the battery if supplied with less. I've tested it down to 20W (which the BIOS warned me about) and it works about the same as when it's in "Battery saver" mode. However, if I put it to sleep or power it down, it'll charge from 20W just fine.

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

I meant the grammatical error of putting a plural after any.

[–] ptz@dubvee.org 2 points 3 days ago

Oh, well, silver lining: the misinterpretation of that comment inspired more discussion than it would have had it been interpreted correctly as grammar pedantry lol

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