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Quick answer: our top pick is Samsung 25W EP-T2510 (25 W · USB-C PD · Samsung original).
Which charger for Galaxy Watch Ultra2?
For fast charging the Galaxy Watch Ultra2, you exclusively need the original Samsung EP-OL715 wireless charger paired with a USB-C power adapter of at least 10 W that supports Power Delivery. This charging puck comes in the box with the watch, but the manufacturer does not include a wall adapter.
If you connect the EP-OL715 cable to a weaker brick without the Power Delivery standard or use a different induction cable, the watch will still recharge, but it will take considerably longer. Any other charger charges this model at standard or reduced speed.
A good foundation for the included charger is a wall adapter with Power Delivery, such as the popular Samsung 25W EP-T2510 or EP-TA800. They provide the appropriate voltage and current, allowing the watch to enter fast charging mode.
How fast does Galaxy Watch Ultra2 charge and how to identify the right cable
Galaxy Watch Ultra2 has an 800 mAh battery that allows for up to 60 hours of operation with the AOD screen on.
According to Samsung's tests, fast charging allows replenishing energy from zero to 40% in 30 minutes. A full charge of the watch with the fast charger and a Power Delivery adapter of 10 W or more takes about 90 minutes, whereas without fast mode, this time extends to 190 minutes.
In an independent test conducted by Android Headlines, charging from 10% to 100% took nearly 2 hours. Meanwhile, Sammy Fans notes that some users observe longer charging times, which is likely affected by the device's temperature during the process.
You can easily distinguish the original EP-OL715 charger from other accessories. On its bottom, there is a lightning bolt icon and clear Fast Charging lettering. Pucks without these markings are older generation versions that do not support fast charging on this model.
Fun fact: Galaxy Watch Ultra2 is the first watch in the Galaxy Watch series where Samsung implemented fast charging technology.
Compatibility with older Samsung chargers and third-party replacements
If you have chargers from previous Samsung watches at home, you can use them, but with certain limitations according to the manufacturer's compatibility chart. The EP-OL300 model, included with Watch7, Watch8, and Watch9 watches, will charge the Ultra2 at standard, normal speed.
The older EP-OR900 puck, known from the Galaxy Watch5 and Watch6 models, charges the Ultra2 noticeably slower. In turn, the EP-OR825 model from the Galaxy Watch4 does not work with the Ultra2 at all and will not charge it.
Older Samsung wireless pads also charge this model slower, as directly stated by Samsung Canada. If you are looking for a replacement on Amazon, stay alert, because many cheap accessories explicitly rule out compatibility with the Ultra2.
A good example is an Autallgee replacement that mentions the Ultra2 model in its title, but in the European technical description lists a power output of just 2.5 W for it and for Watch9. Such a cable will work as an inexpensive spare for work, but it will not replace the factory fast charger.
Below are original Samsung chargers, a power adapter from Samsung's recommended list, a replacement that mentions Ultra2 in its title, and a power bank with Power Delivery.
Recommended chargers for Galaxy Watch Ultra2
1. Samsung 25W EP-T2510
25 W · USB-C PD · Samsung original
Samsung lists this model among the adapters it recommends for Galaxy Watch chargers. It has Power Delivery and more than the 10 W the Ultra2 fast charger needs.
2. Samsung EP-OL300 Fast Wireless Charger
Samsung original · USB-C · ships with Watch7, 8 and 9
The charger Samsung puts in the box with the Watch7, Watch8 and Watch9. Samsung's compatibility table gives it normal speed on all of them, and on the Ultra2 too, just without fast charging.
3. Autallgee Galaxy Watch Ultra2 and Watch9 cable
USB-C · 1 m · braided cable
A replacement that names the Ultra2 and Watch9 in its title. The maker's European listing says plainly that these two watches get the standard 2.5 W from it, so it is a bag spare, not a stand-in for the fast EP-OL715.
See Autallgee Galaxy Watch Ultra2 and Watch9 cable on Amazon →
4. INIU 20000mAh 45W
20,000 mAh · 45 W USB PD · built-in USB-C cable
The number one power bank on Amazon. Its USB-C port has Power Delivery, so on the road it powers the watch's original charger the way the maker asks, and it charges your phone too.
Powering the watch on the go and the lack of PowerShare
Watches up to Watch6 could be charged on the go from the back of a Samsung phone. In the case of the Galaxy Watch Ultra2, the Wireless PowerShare feature has been completely removed.
Fun fact: Samsung dropped the feature of charging the watch from a phone to make room for a new rear health sensor and a redesigned charging coil layout.
On the road, you must therefore rely on traditional power sources. A great solution is a high-capacity power bank equipped with a USB-C Power Delivery output, such as the INIU 20 000 mAh 45 W, to which you can connect the factory EP-OL715 cable.
When packing a power adapter into your bag, choose a model from the manufacturer-recommended list. Samsung officially recommends, among others, the EP-TA800, EP-TA845, EP-TA865, EP-TA220, EP-T4511, EP-T1510, EP-T6530, EP-TB010, and EP-T2510 charging bricks, which meet the minimum requirement of 5 V / 2 A with Power Delivery.
Frequently asked questions about charging Galaxy Watch Ultra2
Which charger for fast charging Galaxy Watch Ultra2?
The only wireless charger that supports fast charging on this model is the original Samsung EP-OL715 puck with a USB-C cable. For the feature to work, you need to plug it into a wall charger supporting Power Delivery with at least 10 W of power.
How many watts does the Galaxy Watch Ultra2 charger need?
The wall charger must deliver at least 5 V / 2 A, which is 10 W of power, and support the USB Power Delivery protocol. You can safely use a higher-wattage charger, such as Samsung's popular 25 W or 45 W models.
Does the Galaxy Watch Ultra charger work with Ultra2?
Samsung does not list the in-box charger from the original Galaxy Watch Ultra separately in its compatibility table. If it does not have a lightning bolt and the Fast Charging label on the bottom, it is not an EP-OL715, meaning the Ultra2 will charge without fast charging. It charges at normal speed with the EP-OL300, slower with the EP-OR900, and fast only on the EP-OL715.
Can Galaxy Watch Ultra2 be charged from a phone?
No, the Wireless PowerShare reverse wireless charging feature does not work with the Galaxy Watch Ultra2. Samsung explained in a customer response that it removed this option due to the new rear sensor design and modified charging hardware layout.
Can I charge Galaxy Watch Ultra2 from a power bank?
Yes, you can charge the watch from a power bank by connecting the original EP-OL715 cable to it. For charging to occur at full speed, the power bank must have a USB-C port supporting Power Delivery with at least 10 W of power.
Sources
- Samsung: Galaxy Watch Ultra2 - manufacturer page (samsung.com)
- Samsung: Galaxy Watch Ultra2 or Watch9 is charging slowly - manufacturer page (samsung.com)
- Samsung: Galaxy Watch Charger Speed & Compatibility Guide - manufacturer page (images.samsung.com)
- Samsung: Find the right charger for your Galaxy Watch - manufacturer page (samsung.com)
- Android Headlines: Samsung Galaxy Watch Ultra 2 review - industry article (androidheadlines.com)
- the5krunner: Galaxy Watch vs Apple Watch Charging Speed - industry article (the5krunner.com)
- Sammy Fans: Galaxy Watch 9's slow charging has users using ice and fans - industry article (sammyfans.com)
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