Fast charging from a laptop

B

balanga

Fast charging a phone is a mystery to me. Some cables can do it others can't not sure what it depends on.

However, is there any way I can get a laptop to fast charge a phone?
 
Don't think there's an adapter. Some laptops (some thinkpads) have a yellow usb socket that stays powered up even when the laptop is suspended or off, I think you have to enable it in a bios setting. But I suspect it's not fast charge. You need the correct charger for the phone to get fast charge.
 
blackbird9 said:
Don't think there's an adapter. Some laptops (some thinkpads) have a yellow usb socket that stays powered up even when the laptop is suspended or off, I think you have to enable it in a bios setting. But I suspect it's not fast charge. You need the correct charger for the phone to get fast charge.
Click to expand...
I have found that the cable you use has some bearing on whether fast charging works. I have a Baseus 100W GaN charger and fast charge only works when I use a cable with USB-C connectors at either end. A supposed fast charge cable does not work when I connect using one of the normal USB ports.
 
balanga said:
Is there any device I can install to provide such a capability?
Click to expand...
No, there's no way to "convert" a non-PD USB socket to a powered one. A standard USB 2.0 port can only deliver about 500 mA @ 5V, USB 3.0 extended this to about ~1A @ 5V. A USB-PD 3.1 port can deliver 5A @ 48V.

So, in order to add PD to an existing USB port you'd have to inject quite a bit of power, you might as well just use a phone charger.
 
I usually just plug the USB-C from the power supply of the laptop directly into the phone. But keep that phone with open case and good ventilated, mine can fast charge the one-week battery in 2h.
 
Crivens said:
I usually just plug the USB-C from the power supply of the laptop directly into the phone. But keep that phone with open case and good ventilated, mine can fast charge the one-week battery in 2h.
Click to expand...
My problem is that I use my phone to provide Internet access via USB tether and charging is very slow.

I really need to get another phone to povide Internet access.

Anyone know how long USB Tethering has been available?

Previously I was using a 'broken' Redmi Note 10 for this purpose, but this feature no longer functions for some reason so need to get something else.
 
The device and the charger will negotiate the voltage. If the charger is able to produce high amperage and they negotiate a high voltage, charging speed will be increased. P = V * I, where P is watts, V is volts, and I amps.

If the charger is a laptop, that depends on the laptop's circuitry and whether it will let the phone have the current.
 
A reasonable laptop should provide enough juice to keep a USB-tethered phone alive indefinitely. You could also use a powered USB hub.

It's the usual problem that you didn't say which laptop and which phone you have.
 
Usually, the phone itself allows either charging or data transfer, but not both at the same time.

If you use your phone for USB tethering, it's not impossible to keep the phone on alive indefinitely (as cracauer@ pointed out). But then the phone needs to have quite a bit of juice to begin with.

This boils down to a bit of planning, maybe, and charging your phone separately BEFORE using the phone as an Internet connection.
 
cracauer@ said:
A reasonable laptop should provide enough juice to keep a USB-tethered phone alive indefinitely. You could also use a powered USB hub.

It's the usual problem that you didn't say which laptop and which phone you have.
Click to expand...
The phone is a Redmi Note 14 Pro 5G and it is connected to a Lenovo ThinkStation M73 with 5 USB ports.

Maybe I had better check which port I'm using. Would that make any difference?
 
SirDice said:
For as long as mobile internet existed. The way it is set up changed a bit over the years but I was able to tether a laptop to a mobile phone to get internet access 20 years ago.
Click to expand...
That's pretty amazing. I'm only just getting used to using it. I find it extremely useful.
 
Traditional (10 years and older) laptops have USB-A connectors, and outputs that only provide 5V at 500mA. And can't be used as power inputs for the laptop.

Modern laptops tend to have USB-C connectors, which are both data connections (usually a combination of USB, video, and other protocols), and power input output. But I don't know whether they are configured to be power-managed adjustable USB outputs, or can only provide 5V.
 
balanga said:
I'm only just getting used to using it. I find it extremely useful.
Click to expand...
Yes, but ... the bandwidth isn't very good, the reliability isn't very good, and depending on your cell phone plan, it can be expensive.

Speaking of 20 years: In the 1990s, there was a mobile internet company here in the SF Bay Area. Forgot their name. They sold a radio that was about the size of a power supply brick, which you attached with velcro to your laptop. Worked in coffee houses and on trains (back then, there was little public WiFi, in particular not mobile). The advent of smart phones and cell service with internet killed that business.
 
ralphbsz said:
Yes, but ... the bandwidth isn't very good, the reliability isn't very good, and depending on your cell phone plan, it can be expensive.
Click to expand...

I just tried Speedtest from one of my laptops connected via my server which has a USB Tethered phone providing Internet access


1778016793662.png
 
ralphbsz said:
That's amazingly good. Must be 5G. Is your bandwidth free?
Click to expand...
It is 5G.

I'm in Poland and have stumbled on a great offer from Orange from which you can buy a starter kit for 5PLN which is currently around $1.40 and if you send an SMS when you register you get 400GB for a month FREE!!!

So I buy a new starter kit every month and get very cheap Internet access ;)
 
All theoretical, but OnePlus has SuperVOOC/Warp/Dash (not sure what it's called exactly :p) that seems different than USB-PD. I wonder if putting a USB port in pin(?) debug mode and emulating OnePlus's fast charge protocol/packets over USB might trigger the fast charge from phone (increase power limit over USB wire), and then USB on the PC disabling over-current protections (I saw a bunch of unlocked BIOS settings for USB stuff)

OP6 reports USB charging modes with adb logcat. I don't know if OnePlus's red cable is special by itself, but in a PC it doesn't do USB-PD's high 3.0A output seemingly because the Dash/fast-charge requires something from the power source to report/allow it (red cable in official OnePlus USB base does Dash)
 
Espionage724 said:
All theoretical, but OnePlus has SuperVOOC/Warp/Dash (not sure what it's called exactly :p) that seems different than USB-PD. I wonder if putting a USB port in pin(?) debug mode and emulating OnePlus's fast charge protocol/packets over USB might trigger the fast charge from phone (increase power limit over USB wire), and then USB on the PC disabling over-current protections (I saw a bunch of unlocked BIOS settings for USB stuff)

OP6 reports USB charging modes with adb logcat. I don't know if OnePlus's red cable is special by itself, but in a PC it doesn't do USB-PD's high 3.0A output seemingly because the Dash/fast-charge requires something from the power source to report/allow it (red cable in official OnePlus USB base does Dash)
Click to expand...
I wiish I understood a single word of this, but it's good to know that we have people on this forum that are familiar with ADB.
 
You must log in or register to reply here.
Back
Top