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Does the power brick matter when charging USB-C devices? (sh.itjust.works)

submitted 1 year ago by [email protected] to c/[email protected]

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Yo everyone. I'm trying to understand how USB power works with batteries, hopefully this is the correct community to ask. We have so many different devices that can be charged with USB-C, yet all the power bricks and power banks have different voltage, amps, watts. Can I use any USB-C brick or power bank with any device and battery and it must intelligently never draw over the limits of the power source?

I thought that USB-C is made for this yet I can read reports that people damaged their Nintendo Switch because of a power brick. How careful do we have to be when charging our phones, tablets, laptops, gaming devices? What exactly to look out for when deciding what to plug in where? Thank you very much for any replies.

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[–] [email protected] 3 points 1 year ago (5 children)

Yes, it is not possible for a USB-C charger to deliver too much power to a device. You should be able to use any USB-C device with any charger - with three caveats.

Firstly, not all USB-C chargers will go up to the maximum limit of your device. If you have a 5v 2A charger supplying 10Watts - that's going to take a long time to fill your device.

Secondly, not all USB-C devices support all possible charging profiles. So you may have a charger which can give one device 65W but not another.

Thirdly, the cable matters. A cheap £1 cable isn't going to be able to to charge at maximum power. Get a cable which is specified for the job.

Here's my review of a USB-C charger which experienced these problems - https://shkspr.mobi/blog/2020/06/review-ylpower-87w-usb-c-charger-msh-87pd/

[–] [email protected] 2 points 1 year ago (4 children)

Thank you very much. I have a follow up question. Is it OK to charge a device which has an original charger of 65W with say a 10 or 22W charger? Is it just the charging speed that's affected or are here overheating concerns as well?

[–] HERRAX 3 points 1 year ago

It can actually be marginally beneficial for the device to be charged with lower speeds than it has the support for. It's kind of like with a car, even though it can run at 120km/h without issues, driving it at 60km/h leads to less wear and tear.

Lower charging power leads to less heat generation as well. So if you charge your phone every night, I'd choose a 10W/22W charger for that purpose, while if you need to charge quickly while at work or say on a train/airplane or whatever, the 65W can be more suitable.

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