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| ▲ | javawizard 5 hours ago | parent | next [-] |
| I gotta say, I love my macbooks. Every Apple laptop I've owned that has USB-C ports will happily charge itself from a 5V/1.5A wall charger (albeit extremely slowly). |
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| ▲ | hnlmorg 5 hours ago | parent [-] | | That hasn’t been my experience. I once tried to charge an M3 MBP via a lower powered wall plug. It was left off over night and the following morning the battery was still at 1%. | | |
| ▲ | Iulioh 4 hours ago | parent | next [-] | | Note: Some devices expect USB-A on the charger side instead of C USB-A pump out 1A5V(5W) regardless of what's connected to it, then it negotiate higher power if available. USB C-C does not give any power if the receiving device is not able to negotiate it | | |
| ▲ | sgerenser 2 hours ago | parent | next [-] | | My work has a little power strip with a usb-c and usb-a jack on it at every desk. I can charge my phone and iPad just fine with a USB-C cable into the USB-C port, but when I plugged my MacBook Air into it, it says “not charging.” Going into the system information tool I can see it’s only running at 10W. So apparently 10W is not enough to charge, but it’s still at least keeping the battery from draining. A 20w charger will definitely charge the MacBook, just slowly. | |
| ▲ | hnlmorg 3 hours ago | parent | prev [-] | | This was a decent USB plug from Anker. I regularly use it to charge things like iPhones and tablets. I knew it wouldn’t supply enough power to run the MBP but thought it should trickle charge the device over night. But it didn’t. I can’t recall which cable I used though. The cable might have been garbage but I’m pretty sure I threw out all the older USB cables so they wouldn’t get mixed with more modern supporting cables. |
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| ▲ | an hour ago | parent | prev | next [-] | | [deleted] | |
| ▲ | saagarjha 4 hours ago | parent | prev [-] | | What did it start at? | | |
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| ▲ | tjoff 4 hours ago | parent | prev | next [-] |
| They probably require higher voltages but I havent seen one myself. I usually just charge y laptop with my phone charger, what is it, 18 watts? Don't care, charges my laptop and the phone that is plugged into it overnight. Why charge at faster speeds when there is no need to Laptop charges fine regular 5V as well. |
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| ▲ | folmar 3 hours ago | parent | prev | next [-] |
| My Thinkpad T490 will happily take any power provided voltage is high enough (15V+). |
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| ▲ | spockz 5 hours ago | parent | prev | next [-] |
| Great. So we got EU laws to mandate USB-C chargers and then get manufacturers that flaunt the spirit of the law by rejecting lower wattages. |
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| ▲ | jeroenhd 4 hours ago | parent [-] | | My laptop refuses to charge for 45W chargers as well, but I can almost understand it. When plugged into 100W chargers while powered on, it takes ten minutes to gain a single percentage point. Idle in power save may let me charge the thing in a few hours. If I start playing video, the battery slowly drains. If your laptop is part space heater, like most laptops with Nvidia GPUs in them seem to be, using a low power adapter like that is pretty useless. Also, 100W chargers are what, 25 euros these days? An OEM charger costs about 120 so the USB-C plan still works out. Other manufacturers do similar things. Apple accepts lower wattage chargers (because that's what they sell themselves) but they ignore two power negotiation standards and only supports the very latest, which isn't in many affordable chargers, limiting the fast charge capacity for third parties. | | |
| ▲ | izacus 3 hours ago | parent [-] | | Which laptop is that? My Razer with 5070 will take 45W chargers just fine, so do the ThinkPads, my work 16" MacBook and previous Asus Zephyrus with 4070. | | |
| ▲ | sgerenser 2 hours ago | parent [-] | | I was on a trip a few years ago and had only brought my “compact” 45w usb-c charger since the brick that came with my work ThinkPad (one of the high end 16” screen models, maybe p16?) was enormous. When I plugged it in Windows complained that the charger was insufficient to charge the laptop. I think it at least kept it from draining the battery though. I had to run to Walmart and get a 65w charger which did the job fine. |
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| ▲ | lostlogin 5 hours ago | parent | prev | next [-] |
| A Mac mini at home used 4.64w averaged over the last 30 days. Even under load it just sips power. |
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| ▲ | _blk 4 hours ago | parent | prev | next [-] |
| The issue might not be the wattage bit rather the minimum voltage. (Some?) Macs seems to charge at 15v already, most laptops need 20v |
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| ▲ | eqvinox 3 hours ago | parent [-] | | Coincidentally, the USB-C spec is written such that wattage implies a minimum set of supported voltages: * ≤15W charger: must have 5V * ≤27W charger: must have 5V & 9V * ≤45W charger: must have 5V & 9V & 15V * (OT but worth noting: >60W: requires "chipped" cable.) * ≤100W charger: must have 5V & 9V & 15V & 20V (levels above this starting to become relevant for the new 240W stuff) (36W/12V doesn't exist anymore in PD 3.0. There seems to be a pattern with 140W @ 28V now, and then 240W at 48V, I haven't checked what's actually in the specs now for those, vs. what's just "herd agreement".) Some devices are built to only charge from 20V, which means you need to buy a 45.000001W (scnr) charger to be sure it'll charge. If I remember correctly, requiring a minimum wattage to charge is permitted by the standard, so if the device requires a 46W charger it can assume it'll get 15V. Not sure about what exactly the spec says there, though. (Of course the chargers may support higher voltages at lower power, but that'd cost money to build so they pretty much don't.) NB: the lower voltages are all mandatory to support for higher powered chargers to be spec compliant. Some that don't do that exist — they're not spec compliant. | | |
| ▲ | sva_ 3 hours ago | parent [-] | | My laptop has $ upower -i $(upower -e | grep BAT)
[...]
voltage-min-design: 11.58 V
And I can charge it via USB-C using a 22.5W powerbank @ 12V (HP EliteBook 845 G10.)I guess that would be out of spec then? edit: nvm I didn't see the qualifier 'minimum' | | |
| ▲ | eqvinox 3 hours ago | parent [-] | | voltage-min-design: 11.58 V
This has nothing to do with USB-C, this is the minimum design voltage of your lithium ion battery pack. In this case, you have a 4-cell pack, and if the cells drop below 2.895V that means they're physically f*cked and HP would like to sell you a new battery. (Sometimes that can be fixed by trickle charging, depending on how badly f*cked the battery is.)If your laptop's USB-C circuitry were built for it, you could charge it from 5V. (Slowly, of course.) It's not even that much of a stretch given laptops are built with "NVDC"¹ power systems, and any charger input goes into a buck-boost voltage regulator anyway. ¹ google "NVDC power", e.g. https://www.monolithicpower.com/en/learning/resources/batter... (scroll down to it) |
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| ▲ | izacus 3 hours ago | parent | prev [-] |
| Most laptops will take 45W. There might be some workstations that don't, but even gaming stuff with 5080s will charge on 45W. |
