The Samsung Galaxy Watch4 and Watch Active4 are expected to be announced in the second quarter of this year (April-June). They may mark an important shift in strategy for Samsung as the company is expected to replace Tizen with Android. It appears that the 3C has certified a 240 mAh battery for use in the SM-R880, which is presumably the 41mm version of the Galaxy Watch4. For comparison, the 41mm Watch3 has a 247 mAh battery, the 45mm one steps up to 350 mAh. 3C certification for the EB-BR880ABY battery for the upcoming Galaxy Watch4 This certification also suggests that the new...
Source: https://www.gsmarena.com/samsung_galaxy_watch4s_battery_may_have_just_been_certified_by_the_3c-news-48237.php