Which charger for Galaxy Watch9 - which old chargers still work

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Which charger for Galaxy Watch9?

For Galaxy Watch9 to work properly, you need the original Samsung EP-OL300 puck and a USB-C Power Delivery power adapter with a minimum of 5 V and 2 A, which is 10 W. If you are looking for a third-party replacement or docking station, choose only models that explicitly list Watch9 on their compatibility list.

Inside the box with the watch, you will find a magnetic wireless charger. Samsung does not include a wall charger, so you need to buy a wall adapter or use one you already have at home.

Choosing a random accessory quickly leads to problems. On its technical support pages, the manufacturer notes that Watch9 and Ultra2 charge best exclusively with dedicated accessories. An incompatible charger may cause slow charging, constant session interruptions, repeated reconnections between the watch and the base, or error messages appearing on the screen.

Galaxy Watch9 charging time and the rising temperature issue

Samsung officially states that a full recharge from zero takes 80 minutes for the 40 mm version and 90 minutes for the 44 mm variant. It is worth noting that Galaxy Watch9 does not support fast charging standards, so you will not speed up the process with a more powerful adapter.

Measurements in independent reviews yield similar results. Notebookcheck recorded a time of around 1.5 hours from zero, while in Android Headlines tests, filling the battery took nearly 1 hour and 50 minutes.

In practice, these times can be significantly worse for some users. Sammy Fans and Mezha report complaints from watch owners whose recharge takes anywhere from 2 to even 4 hours. The likely cause of this issue is the device's thermal protection.

According to these reports, when the watch heats up significantly, it throttles power intake from the initial around 5.5 W down to 3.5 W or even lower values. Some users also note that certain third-party docking stations and older cables from previous generations perform noticeably worse with this model. Samsung has not yet published an official explanation for these speed differences.

Fun fact: Some users struggling with power throttling have decided to tackle the problem with DIY methods, cooling their watch during charging with a small desk fan or placing it near ice.

Compatibility: which older Samsung chargers work

If you have magnetic pucks from previous smartwatches by this brand lying in a drawer, check their model markings on the casing. According to Samsung's official compatibility chart from August 2026, the situation is as follows:

• EP-OL300 (the standard model from Watch7, Watch8, and Watch9) - charges at normal speed.
• EP-OL715 (charger bundled with Galaxy Watch Ultra2) - charges Watch9 at normal speed.
• EP-OR900 (puck from the Galaxy Watch5 and Watch6 series) - works, but charges the watch more slowly.
• EP-OR825 (older cable from the Galaxy Watch4 generation) - does not work with Watch9 at all.

Older Samsung wireless pads will also charge this model at a significantly lower speed. If you are looking for a wall charger, the manufacturer officially recommends specific USB-C Power Delivery adapters. These include models EP-T2510, EP-TA800, EP-T1510, EP-TA220, EP-TA845, EP-T4511, EP-TA865, EP-T6530, and EP-TB010.

Be very careful when buying replacements on online marketplaces. Many popular accessory brands, such as MoKo, SwanScout, JoyGeek, and ACEQINGSE, explicitly exclude Galaxy Watch9 support in their product descriptions. If you need a replacement, look for brands that declare compatibility with this model, such as Ermorgen or Aimtel.

Fun fact: Galaxy Watch9 uses the exact same EP-OL300 charger model that the manufacturer bundled with the earlier Galaxy Watch7 and Watch8 generations.

Below, we have compiled power adapters and charging accessories that meet the manufacturer's requirements or explicitly declare compatibility with Galaxy Watch9.

Recommended chargers for Galaxy Watch9

Powering Galaxy Watch9 on the go and while traveling

When taking the watch on a trip, you must remember to bring the dedicated cable. Samsung Galaxy Watch9 does not support Wireless PowerShare, which means you cannot recharge it by placing it on the back of a Galaxy smartphone.

The most convenient solution on the road is to pack the factory EP-OL300 puck and connect it to a good power bank. However, the device must have a USB-C port with support for the Power Delivery standard to provide stable power output.

A good example of such equipment is the INIU 20 000 mAh power bank with USB-C PD output. Such a power bank will easily handle the original watch charger according to Samsung's guidelines, while also allowing you to charge your phone.

Questions and answers about charging Galaxy Watch9

Does the charger from Galaxy Watch8 fit Galaxy Watch9?

According to Samsung, yes: both watches include the same EP-OL300 charger in the box, and in the official compatibility chart, it charges Watch9 at normal speed. However, some owners report that Watch8 chargers perform worse with Watch9, so if charging takes too long, try the charger from the Watch9 box.

Why is Galaxy Watch9 charging so slowly?

The most commonly cited reason for charging taking 2 to 4 hours is temperature. According to reports, a warm watch lowers its power draw from the initial 5.5 W to 3.5 W or less to protect the battery. Slower charging may also result from using an older EP-OR900 puck or an incompatible docking station.

Which power adapter for Galaxy Watch9, how many watts?

You need a power adapter with a USB-C port and Power Delivery technology that delivers at least 5 V and 2 A, which equals 10 W of power. According to owner reports, the watch itself draws around 5.5 W, but the power adapter should meet Samsung's requirements. Original Samsung charging bricks work well, such as the EP-T2510 or EP-TA800 models.

Can Galaxy Watch9 be charged from a Samsung phone?

No, Galaxy Watch9 does not support reverse wireless charging from a phone, also known as the Wireless PowerShare feature. This information is provided on Samsung's support page. Placing the watch on the back of a Samsung smartphone will not start the charging process.

Can I charge Galaxy Watch9 from a power bank?

Yes, you can charge this watch from a power bank, provided you connect the dedicated EP-OL300 magnetic puck to it. The power bank must have a USB-C output supporting the Power Delivery standard and provide power of at least 5 V and 2 A. An example of a compatible power bank is the INIU 20 000 mAh model.

Sources

• 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: Galaxy Watch9 - manufacturer page (samsung.com)
• Samsung: Find the right charger for your Galaxy Watch - manufacturer page (samsung.com)
• Android Headlines: Samsung Galaxy Watch 9 review - industry article (androidheadlines.com)
• Notebookcheck: Galaxy Watch9 in review - industry article (notebookcheck.net)
• Sammy Fans: Galaxy Watch 9's slow charging has users using ice and fans - industry article (sammyfans.com)
• Mezha: Owners are cooling their Galaxy Watch9s with ice due to slow charging - industry article (mezha.ua)
• the5krunner: Galaxy Watch vs Apple Watch Charging Speed - industry article (the5krunner.com)