Hereās my battery testing for the Prime 2 for the past couple of days:
TEST 1: Left the Prime 2 turned on with WiFi connected and screen off, charged to 100% to test drain overnight. Eight hours later in the morning it was at 85%.
Strapped it on and went out with it playing and taking pictures. Seven hours later it was at 50%. No GPS but heavy screen on time with the camera in bright sun (and could easily see the image on the screen!).
Itās now three hours later and the watch has been sitting on the desk. Just checking it. 40%.
So letās see, weāve got 8 + 7 + 3 = 18 hours of moderate use mixed with some quiet time and 40% still remaining.
Add another 3 hours of heavy use installing apps, now at 15%
TEST 2: Started charging at 15%. After 20 min, 25%. After 40 min, 40%. After 60 min, 55%. After 90 min, 75%. After 120 min, 95%. All rounded to nearest 5%.
Remember, these charging times started from 15%, not from 0%. Itās also not good for the battery to overcharge to 100%, so I stopped at 95%. Hope this helps!
TEST 3: After charging to 95%, I put the watch in Power Save for 16 hours untouched, and it dropped to 85%. After 18 hours, 83%. Thatās a drop of 12% in 3/4 of a day.
TEST 4: Starting at 85%, after 1.5 hrs, moderate use, 79%, after total of 4.5 hrs moderate use, 68%, after 7 hrs of moderate and light use, 60%. Thatās a drop of 25% total. Now, taking watch off for the evening/night, after 11 hrs total, 53%, after 22 hrs total, 34%, and after 24 hrs total, 25%. Thatās a drop of 60% total including day use and overnight no-use.
TEST 5: Here we go. A day of wearing it, some camera, some GPS fitness, some calls, even a Duo video call (what fun!) and, of course, checking time and collecting pedometer step count info. Started 7:20 AM at 98%. Ended test at 5:20 PM with 43% left. Thatās 10 hours. Slapped it on the charger and filled it up to 80% in one hour.