Pixel watch 5 battery life is great, it will be a non issue
Charged to 100% at 2 pm Sun, 1 hr GNSS
Mon 75 to 87 bad charge connection
Tue 47 to 87
Wed 56 to 94
Thu 62 to 87
Fri 40 to 78
Battery pack: 100 to 97. This should last almost 25 weeks on a single charge.