I used to go a day charging my phone just twice. After the update, One Ul version: 5.1Current version: G990BXXS3EWC4/
G990BOXM3EWC4 / G990BXXS3EWC4, I have to charge my phone more than 4 times in a day even with reduced usage. I don't think it's a reduced battery power as I've used this phone for only exactly a year now