How To Fix Galaxy Watch Ultra 2 Slow Charging Or Won’t Charge
Your Galaxy Watch Ultra 2 is taking hours to charge, or it will not charge at all.
Samsung says the Ultra 2 only fast charges with a specific charger and an adapter of at least 10W, and a mismatch drops it to the slower normal speed.
Check the steps below in order to find which part of your charging setup is holding it back.
Quick answer: how fast should Galaxy Watch Ultra 2 charge?
| Charging mode | Samsung charge time | What it needs |
|---|---|---|
| Fast charge | 90 minutes | EP-OL715 charger plus 5V/2A (10W) or higher adapter |
| Normal charge | 190 minutes | Any setup that does not meet the fast-charge needs |
If your watch takes longer than 190 minutes, something other than the speed mode is wrong.
Samsung’s related help also lists the charging environment, physical obstructions and incompatible adapters as common causes of slow charging.
Start with the accessories, because they cost nothing to check and are the causes Samsung itself names.
What are Ultra 2 owners reporting?
PhoneArena reported in August 2026 that one Ultra 2 owner needed more than 4 hours to charge.
Android Authority, as of August 12, 2026, said a Watch Ultra 2 user reported four hours at room temperature.
Both outlets said Samsung had not yet commented, and Android Authority noted the issue does not affect every unit.
Why is fast charging not kicking in?
Samsung says the Ultra 2 charger works as a fast charger only with an adapter rated 5V/2A (10W) or higher.
Any weaker source falls back to normal charging, which Samsung rates at 190 minutes instead of 90.
That alone can double your charge time, so check the adapter before anything else.
Samsung’s page includes a photo of the back of the EP-OL715 so you can confirm which charger you own.
How does the Ultra 2 differ from the Watch 9?
Samsung lists different charge times for each model, and only the Ultra 2 supports fast charging.
| Model | Fast charge | Normal charge |
|---|---|---|
| Galaxy Watch 9 (40mm) | Not supported | 80 minutes |
| Galaxy Watch 9 (44mm) | Not supported | 90 minutes |
| Galaxy Watch Ultra 2 | 90 minutes | 190 minutes |
So a Watch 9 on a normal charge finishing in 90 minutes does not mean your Ultra 2 should do the same without fast charging.
Use the right Ultra 2 charger
- Ultra 2 fast charger: Samsung lists model EP-OL715.
- Original Galaxy Watch Ultra: Samsung lists EP-OL300, which is a different charger.
- Unsupported: Samsung says the EP-OR825 does not support the Ultra 2.
Samsung’s page does not say the EP-OL300 works for the Ultra 2, so use the EP-OL715 that came in the box.
| Watch | Samsung-listed charger |
|---|---|
| Galaxy Watch Ultra 2 | EP-OL715 |
| Galaxy Watch Ultra | EP-OL300 |
| Galaxy Watch 9 | EP-OL300 |
| Galaxy Watch 6 and Watch 5 | EP-OR900 |
Pick the right wall adapter
Samsung recommends a Samsung adapter rated 5V/2A or higher with Power Delivery.
- Recommended models include EP-TA800, EP-TA845, EP-TA865, EP-TA220, EP-T4511, EP-T1510, EP-T6530, EP-TB010 and EP-T2510.
- Avoid older AFC or QC chargers, portable power banks and USB ports without PD.
- Do not charge through a PC or a multi-port hub.
| Power source | Effect on charging | Samsung advice |
|---|---|---|
| Samsung PD adapter, 5V/2A or higher | Works as intended | Recommended |
| Older AFC or QC charger | Can limit speed | Avoid |
| Portable power bank | Can limit speed | Avoid |
| USB port without PD | Can limit speed | Avoid |
| PC or multi-port hub | Can slow or prevent charging | Do not use |
Clear the contacts and remove obstructions
- Take the watch off any thick case, metal strap or unofficial cover.
- Wipe the back of the watch and the charging pad to remove sweat, dust or liquid.
- Keep the pad dry, because Samsung says it is not waterproof.
- Set the watch back on the charger and watch for the charging indicator.
Could heat be slowing the charge?
Samsung says a watch feeling warm while charging is normal.
Owners quoted by PhoneArena reported thermal throttling on the Watch 9 line, with one test showing power dropping from about 5.5W to about 3.5W.
That test was on a Watch 9, so treat it as a lead for the Ultra 2 and not proof, and charge in a cool room with the pad kept dry.
Run the Samsung Members charging test
- Open Samsung Members on the paired phone and tap Support.
- Under Connected device diagnostics, select your Galaxy Watch.
- Tap Wireless charging to start the automated test.
You can also tap the individual icons there to test other hardware functions on the watch.
Samsung says menu names may vary by watch, phone and app version.
Is a software fix coming?
When PhoneArena and Android Authority published, Samsung had not commented and no fix had been announced.
PhoneArena described a firmware update as something owners hoped for, not a confirmed fix.
Check Samsung’s support pages again if the accessory changes above do not help.
Do not rely on Wireless Power Sharing
Samsung says Wireless Power Sharing from a phone is not supported on the Galaxy Watch Ultra 2.
It also notes that this method is slower in general, so use the dedicated charger instead.
When to contact Samsung
If charging is still slow with the dedicated charger and a genuine Samsung adapter, Samsung advises visiting a service center with both the charger and the adapter.
Online help is available through Samsung chat support or the Samsung Members app.
What counts as a real charging problem?
Anything beyond Samsung’s 190-minute normal-charge figure suggests the cause is not just the speed mode.
Samsung also says an incompatible charger can cause failures, repeated reconnections or charging error notifications.
Work from the cheapest check to the most involved, and stop as soon as charging returns to normal.
Which fix do you need?
| Symptom | Likely cause | Fix |
|---|---|---|
| About 190 minutes to charge | Normal mode, not fast | Use EP-OL715 with a 5V/2A or higher adapter |
| Over 4 hours | Heat, dirty contacts or bad accessory | Clean contacts, change adapter, run diagnostics |
| Not charging at all | Unsupported charger | Stop using EP-OR825 |
| Charges from a PC port | Low input power | Use a wall adapter |
More Samsung watch help: Galaxy Watch 9 charging fixes, Galaxy Watch Ultra battery drain and Galaxy Watch 5 not charging.
Sources: Samsung Watch9 and Ultra2 slow charging, Samsung slow or interrupted charging and PhoneArena owner reports.