Always On Display drains nearly 2% of battery per hour on my S24 Ultra. This is much higher than the S23 Ultra. Hopefully this will be fixed in an update?
The first day buying the S24 Ultra the battery sucked then the next two days it was awesome, I would unplug the phone at 7:30 am and still have 46 percent left at 1:30am now I have to charge it before 1:30 because it dies.
You have to cycle the battery. 100% all the way to 0 no charging in between and don't leave connected through the night. Do that about 4-5 times and you will be back in track.
Battery life on my S24U is totally amazing. It has been awesome since day one and gets better every day. It's nothing for me to still have 50% plus left over after being disconeccted from my charger for 12-14 hours or longer each day. I'm loving this phone.!!
Lithium batteries are practically voodoo compared to alkaline batteries we're all used to. Unless you're a chemist by trade, lithium batteries behave in such a weird way that it's almost impossible to understand how they work or fail. But it sounds like your battery has ruptured and needs a replacement.
