I put my Apple Watch on when i got up this morning at about 8AM and have been using it all day, It has 48% battery life left right now at 12:39AM. I will put it back on it's charger when I go to bed in an hour or so when I go to bed. It always has more than enough to get through an entire day.
As for replacing your pictured current watch. . . not a chance. Nobody can replace a lying bastard of a watch like that.
That in itself is good reason to upgrade. I have to admit, when my Bill Clinton watch says, "It is 2:30pm," I'm in doubt, having echos of "depends on what the meaning of is, is." So I'm always having to consult another watch or clock anyway, just to be sure that SOB is lying again!