The charger is at home, or in the hotel you left this morning, and the phone is on eleven percent. You have a cable and a room full of things with sockets in them.
Most of those things will charge it, so there is no need to panic. They will not charge it at the same speed though, and picking wrong costs you an hour.
I went to what the phone makers actually publish about this, because the ranking below is the bit nobody puts in order for you.
1. The ranking, in one screen
Start at the top and work down, because the gap between first and last is large. A wall adapter borrowed from anything else is the fastest thing in the room: a tablet, a laptop, a friend's phone.
After that a power bank, if anyone near you has one.
Then a laptop's USB port, always available and always slow. Below it a car, a television, a games console or a hotel bedside socket. All of them work, all of them slowly, and the last three are easy to forget.
2. Why any wall adapter beats any computer port
A phone maker states the principle the ranking rests on.
Google says it plainly about the two kinds of plug on its charging page: a USB-A power adapter "charges your phone slower than a USB-C power adapter with a USB-C cable."
A modern USB-C wall adapter tops the list, and a tablet's adapter is usually the strongest in the house. An old phone's small adapter still beats a laptop port. It was built to charge a phone. The port was not.
Match the cable to the adapter. A USB-C adapter with a USB-A cable hanging off it gives you the slower of the two.
3. The laptop port, and why it disappoints
Always there, always disappointing, and it helps to know why. A computer's USB port is a data port that happens to supply power, and charging was never its job.
Ports differ, and the shape hides it. What each socket can actually do is worth knowing.
A sleeping or shut-down laptop usually stops supplying power, and some have one always-on port, often marked with a small lightning symbol.
It will still get you from eleven percent to enough to make a call. Slow is not nothing when you have an hour.
4. The sockets people forget are right there
Four of them, and one is probably within your reach right now. A car works through the USB socket or a lighter adapter. The USB socket in older cars is very slow, and the lighter adapter is much faster.
A television next. Most have a USB port on the back, and many keep it live while the set is on, so try yours. A games console does the job too, and the front ports charge a phone perfectly well.
A hotel or airport socket built into a lamp or a seat. Slow, shared, and better than nothing.
5. Phone to phone, if the other phone is willing
Newer than most people expect, and it needs the right pair. Documented by Google and by other makers under their own names: many recent Android phones can charge another device wirelessly, back to back.
The maker has to have built it in, and I would check the donor phone's settings rather than assume. It is slow and it costs the donor a lot of battery. Use it for an emergency ten percent, not a full charge.
Some phones will do it over a cable too, with an adapter, though fewer than the marketing suggests.
What will not work, so you stop looking
Two of these come up every time. A wireless charging pad without power is a coaster. It needs its own adapter, and that is usually what you left behind. A dead power bank charges nothing either.
That last one is ours, and it catches people who carry a bank and never top it up. Hand-crank and solar chargers exist and are genuinely slow, and they are camping equipment rather than an answer to a flat phone in a hotel.
Rubbing, warming or freezing a phone does nothing good. Heat is what shortens a battery's life in the first place.
While you are plugged into something slow
Get more out of the trickle. Turn the screen off and leave it off. The screen is the biggest draw on the phone by a distance.
Airplane mode too if you can afford to be unreachable, and hunting for signal is the second biggest.
Do not use it while it charges from a weak source. You can genuinely lose ground at the bottom of the range.
And if it charges slowly from a proper charger too, that is a different problem. Slow charging has its own causes worth ruling out.
**Status: put together on 18 September 2026 from Google's published charging guidance for its phones, plus the ordering and the household sources, which are ours.
No charging speed was measured here, no phone was tested against a stopwatch, and every comparison below the vendor quote is a ranking rather than a figure.**
Can I charge my phone with a laptop?
Yes, with the cable straight into a USB port, and it will be slow. A computer port is a data port that supplies some power rather than a charger.
A sleeping or shut-down laptop usually stops supplying it unless the port is marked as always on.
What is the fastest way to charge without my own charger?
Borrow any wall adapter, ideally a USB-C one from a tablet or laptop. Google's own wording is that a USB-A adapter charges slower than a USB-C adapter with a USB-C cable, and any wall adapter beats any computer port.
Can one phone charge another phone?
Many recent Android phones can, wirelessly, held back to back, if the donor phone has the feature built in. It is slow and it drains the donor quickly, so treat it as an emergency top-up rather than a charge.
Does a wireless charging pad work without a plug?
No. The pad has no power of its own and needs its adapter, which is usually the part you left at home. A pad on its own does nothing at all.
The Short Version
- Any wall adapter beats any computer port. Start there.
- A tablet or laptop adapter is usually the strongest one in the house.
- Google says a USB-A adapter charges slower than USB-C with a USB-C cable.
- A laptop USB port works and is slow, and many stop when the laptop sleeps.
- Cars, televisions, consoles and built-in seat sockets all charge, all slowly.
- Some Android phones charge another phone back to back, slowly, at the donor's expense.
- A wireless pad without its own adapter does nothing.
- Screen off and airplane mode make a weak source go further.
Where to Next
Look for a borrowed wall adapter before you plug into anything else, because that one choice is most of the speed. Match the cable to the adapter, since the slower of the two decides what you get.
If the only thing available is a laptop, plug in, turn the screen off and leave it alone. And check whether your laptop keeps its ports live when the lid is shut, because that decides whether overnight works at all.
If you got a phone charged from something not on this list, say what it was in the comments. That list is worth growing.
Isaac Smith is the founder and editor of PC Glance, a website that covers computers, laptops, and technology. He is a tech enthusiast and a computer geek who loves to share his insights and help his readers make smart choices when buying tech gadgets or laptops. He is always curious and updated about the latest tech trends.