I have galaxy watch ultra 2024. Its battery doesn't last for even 2 days, when it states that it should keep up to 100 hours. I saw that sometimes the sensors at the back of the watch keep flashing green, and seems that heart beat measurement is always on, although I've set it to manual. If I take the watch off the wrist, it stops and doesn't start again after wearing it back. I did not find anything online regarding this strange behavior
It's not strange behavior, it's perfectly normal. The green lights are wrist detection. If you are seeing the sensor lights your watch is too loose. Even when set to manual HR, your pulse is always being tracked for such things as sleep detection, stress level; and if you have irregular heartbeat detection on, it will override the manual read setting. You would be lucky to get two full days of charge out of a watch in normal use. 32-36 hours is pretty normal. You might be able to eke out a full two days or more if you have it set to "watch only" mode, but that would kind if defeat the purpose of having a smart watch. You have a charger, and the watch takes about an hour to charge, so just charge it every morning while you are getting ready for your day. No need to run your battery down to zero before putting it on the charger. The time to worry would be if you are not getting at least a full 24 hours out of the battery.
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