A Galaxy S24 charges at 25 W wired and 15 W wireless, a slower rate than the S24+ and the S24 Ultra, so a long charge on this phone is expected. When it slows or stops further than that, the order of checks is the port, the cable and adapter, Protect battery, and the heat. Some S24 owners reported throttled, hot charging after the July patch, which is the phone slowing the charge to protect the battery; moving the charge to a cooler place without the case is the first test. A phone that will not charge on two good adapters needs a Samsung repair.
Differential
Likely causes of “Samsung Galaxy S24 will not charge or charges slowly”, and how to tell them apart
- 1
Heat slowing the charge on a 25 W phone
What separates it The first minutes are quick and then the rate falls while the back is warm in use
How to confirm Rest the phone without its case in a cool room and charge it untouched; the S24 manages its charge rate by temperature
- 2
Debris in the USB-C socket
What separates it The plug seats loosely, or charges only when pressed to one side
How to confirm Switch the phone off, light the socket and ease out the fluff with a wooden toothpick
- 3
An adapter that is not a 25 W PPS unit
What separates it A full charge takes over two hours, which is slower than the S24's rating
How to confirm Use Samsung's 25 W adapter or a PD PPS charger with a 3 A cable
- 4
The 85 percent ceiling
What separates it It always stops short of 100 and says it is protected
How to confirm Settings, Battery, More battery settings, Protect battery, and choose Basic
- 5
A wireless pad that does not line up
What separates it The charging symbol flickers on the pad and the case is on
How to confirm Center the phone without a case on the pad's coil
Before you touch a setting
Record this first — changing settings destroys the evidence
- The wattage printed on your adapter and whether the cable is rated 3 A
- What the lock screen says in the first minute, and again at ten minutes
- Whether the phone is warm to the touch while the rate falls
- How long a charge from 20 to 50 percent takes on a wall socket
Try in this order
0 of 6 completedLet it cool, then start again
ReversibleUnplug, take the case off and leave the phone for ten minutes in shade, then charge idle on a hard surface and watch the rate.
Try the adapter and cable you trust
ReversibleA wall socket, Samsung's 25 W adapter and a 3 A cable is the reference pair for the S24.
Look into the socket
ReversibleWith the phone off, light the USB-C socket and clear packed fluff with a wooden toothpick, scraping the walls.
Look at the charge ceiling
ReversibleSettings, Battery, More battery settings, Protect battery: Maximum stops the S24 near 85 percent.
Test in Safe mode
ReversibleRestart in Safe mode and charge for twenty minutes; if the percentage rises, an app was holding the charge back.
Have the phone test itself
ReversibleSamsung Members, Get help, Phone diagnostics, Battery and charging reports on the cell and the circuit.
Model-specific
What is true of this model and not of its siblings
- Why S24 charging confuses people
- The S24 is rated 25 W while the S24+ and S24 Ultra take 45 W, so an owner who has used a larger Samsung phone expects a faster charge than this one gives.
- What changed after the July patch
- Owners reported charging that slowed and the phone running warm; the S24 manages its charge rate by temperature, so a cooler place and no case are the first things to test before concluding there is a fault.
Stop boundary
When this stops being a self-service repair
- !A phone that charges only when the cable is held at an angle needs its USB-C port replaced at a Samsung center
- !If two adapters that charge another phone at full speed leave the S24 slow, ask Samsung for a charging diagnosis
- !A hot, swollen or smelly phone is a same-day service visit
Evidence ledger
Sources behind this answer
Owners describing throttled charging with heat after the July update.
Per-model battery, charging, chip, display, storage and update promise for the S24, S24+ and S24 Ultra.
Exact questions
Common questions
How fast does the Galaxy S24 charge?+
Wikipedia lists 25 W wired and 15 W wireless for the S24, which is slower than the S24+ and S24 Ultra at 45 W.
Why does my S24 charge slowly and get warm?+
Fast charging in a case, or a patch that changed charging behavior, can make the phone slow the rate to protect the battery. Cool it and charge it idle.
What adapter does the S24 need?+
A USB PD PPS adapter gives the full 25 W; any USB-C charger works, but slowly.
Why does charging stop before 100 percent?+
Protect battery is on its Maximum setting; switch it to Basic for a full charge.