The FCC has released some information about all three Samsung Galaxy Watch5 Series models in terms of battery charging. The three models are the SM-R900, SM-R910 and SM-R920, with the first two being the 40’s. mm and 44 mm of the Galaxy Watch5, the last model will be the Galaxy Watch5 Pro.
The main information revealed by the FCC states that the Galaxy Watch5 Series charging test is 10W (5V/2A), up from the Galaxy Watch4 Series that is only 5W charging.
As for the Galaxy Watch5 Series, the two main models will both get more batteries. The 40mm and 44mm Galaxy Watch5 have 276mAh and 397mAh respectively, while the Galaxy Watch5 Pro has 572mAh.
In addition, there is information from @UniverseIce that states that the Galaxy Watch5 Pro will not have a rotating bezel and still have a fairly thick bezel.
Source: GSMArena, Twitter, MySmartPrice, FCC