A Galaxy S23 Ultra is three and a half years old, and when it charges slowly or stops the cause is most often the cable, the port or a battery that has had its years. Its 45W wired charging needs a USB PD charger with PPS, and GSMArena lists 15W wireless. A phone that charges only at one cable angle has a worn or dirty port; one that charges but holds little has a worn battery. Clean the port, swap the cable and charger, then run the battery test in Samsung Members before you buy a charger.
Differential
Likely causes of “Samsung Galaxy S23 family will not charge or charges slowly”, and how to tell them apart
- 1
A worn or dirty USB-C port
What separates it Charging starts only when the plug is held at a tilt, or the plug sits loose
How to confirm After years of daily plugging the port gets lint-packed and slack; clear it with a wooden toothpick and test a second cable
- 2
A moisture or heat warning
What separates it The phone shows Moisture detected or Charging paused because of temperature, and the charge stops
How to confirm Unplug, let the port dry or the phone cool, and charge again; a warning that returns after drying points to the port
- 3
A battery protection limit
What separates it It stops charging at 80 or 85 percent and never reaches 100, depending on the One UI version
How to confirm In Settings, Battery, Battery protection, change the limit if you want a full charge
- 4
A charger without PD and PPS
What separates it It charges but slowly
How to confirm For the 45W rate the charger must be USB PD with PPS support
- 5
An aged battery
What separates it It charges to 100 but falls quickly and the phone runs warm
How to confirm Run the cell check in the Samsung Members app
- 6
Fast charging off
What separates it All chargers give the same slow speed
How to confirm Look for the Fast charging switch in the Charging settings menu under Battery
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether charging only works with the plug tilted
- The wattage printed on the charger, and any PPS mention
- The battery test result in Samsung Members
- Whether a Qi pad still charges the phone
Try in this order
0 of 5 completedClean the port
ReversibleWith the phone off, shine a flashlight into the USB-C port and pick out any lint with a wooden toothpick.
Swap cable and charger
ReversibleBorrow a cable and charger you know are good and use a wall socket, not a computer.
Check the setting
ReversibleGo to Settings, Battery, Charging settings and make sure Fast charging is on.
Test the battery
ReversibleIn the Samsung Members app choose Support, Phone diagnostics and then Battery.
Read the on-screen message
ReversibleIf the phone shows Moisture detected or says charging is paused for temperature, unplug it and wait before trying again. Both stop charging on purpose to protect the port and the cell.
Stop boundary
When this stops being a self-service repair
- !If a Samsung charger and a clean port still give nothing, take it to Samsung support
- !A loose port needs a port repair, and a failed cell check means asking for a battery quote
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why does it charge only when the plug is tilted?+
A worn or dirty USB-C port; clean it, and book a port repair if the cable still wobbles.
When does the battery, not the port, need replacing?+
When the phone charges at any angle but loses charge quickly, runs warm or shuts off at 20 to 30 percent. The cell check in Samsung Members shows whether the battery has worn.
How can I tell how fast the S23 Ultra is charging?+
The lock screen names the mode while it charges: Super fast charging when the 45W mode is active, Fast charging at the older rate and Charging when it is slow.
Is Wireless PowerShare the same as wireless charging?+
No. Wireless PowerShare lets the S23 Ultra charge another device from its back and drains its own battery, so leave it off when you are trying to charge the phone.
Can a thick case slow charging?+
On a wireless pad, yes: a thick or metal case adds distance and heat, and the phone falls back to a slower rate. Wired charging is not affected.
What does Moisture detected mean on the S23 Ultra?+
The phone senses water in the USB-C port and stops wired charging to avoid damage. Unplug it, let the port dry and try again; use a wireless pad in the meantime if it is urgent.
Why does my S23 Ultra stop short of 100 percent?+
Battery protection may be set to a limit. Look in Settings, Battery, Battery protection and choose a different option if you want it to charge to 100.