Your battery is your energy store, a figure out of 100 worked out from your heart rate through the day and night. Sleep charges it most, and workouts drain it most. It's on the Energy page and on Home.
What charges and drains it
- Sleep charges it most. A calm, slow heart overnight is your body recovering, and a nap charges it too.
- Workouts drain it most, and harder sessions take more. A heart rate that stays raised afterwards can keep draining it while you recover.
- A raised heart rate while you're sitting still drains it. Stress, a large meal, illness, alcohol and, for some people, caffeine can all do this.
- The rest of your day drains it slowly. Calm, relaxed stretches cost the least.
It carries over from day to day: tonight's sleep charges from wherever today leaves it, so a hard day and a short night start tomorrow lower. It stops at 100, so a long lie-in can't bank extra for tomorrow.
Reading the chart
- The figure is your level at your watch's last reading, with its time, for example "45 as of 15:59". It moves on when your watch next syncs.
- The colour is your level now: blue when it's high, ochre in the middle, rose when it's low.
- The shaded band is your usual: where your battery sat at this time of day on your recent days. It appears after 7 days.
- The icons mark what happened, such as your sleep, a workout or a nap.
- A dotted line is a stretch with no heart rate, such as while your watch was charging. NOYU fills the gap and draws it dotted.
On a past day, the figure is that day's high and low.
Behind your battery
Under the chart, Behind your battery lists what charged and drained it: Sleep, Nap, each workout and the time after it, Waking up, Walking, After a meal, HR elevated, and Day to day for everything else. Tap a row to see when it happened and how it moved your battery. Charged and Drained add up the day so far, each against your usual for this time of day.
HR elevated
HR elevated is a stretch when your heart rate rose well above your resting while you were barely moving. Tap + Label to say what it was, such as stress or a coffee, and the label goes into your Journal at that time. If you log a coffee or a drink in the Journal around then, NOYU labels it for you.
When there's no battery
Your battery needs heart rate through the whole day, not only during workouts and sleep. If your watch or band doesn't send it, the Energy page shows your body clock and your energy ratings, without a battery.
With past data from your watch, your battery starts from your first day. Without it, your battery starts the morning after your first night with your watch.
How you feel
Your battery comes from your heart rate, so how you feel can differ from it. That's why Your energy on the Energy page asks you to rate your energy, so the two sit side by side.
Garmin's Body Battery, Bevel and other apps work out their own versions, so their figures won't match NOYU's.
