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2. Click the gear icon in the top-right corner of the dashboard and select
Settings.
3. Using the navigation tabs on the left, find Heart Rate Zones and specify the
minimum and maximum heart rate for your custom zone.
4. Sync your Charge HR to update your tracker with the new setting:
a. Click the Fitbit Connect icon located near the date and time on your
computer.
b. With your Charge HR nearby, click Sync Now.
At any time you can check your dashboard to see the amount of time you’ve spent in
your custom zone.
For more details about heart rate monitoring, including links to relevant American
Heart Association information, see our “Heart rate FAQs” article on
https://help.fitbit.com.
Battery life and charging
Your Charge HR contains a rechargeable lithium-polymer battery.
With normal use, your fully charged Charge HR should last about five days before
needing a charge. You can check the level of your battery by logging into Fitbit.com
and clicking the gear icon on the top-right corner of the page.
When you press the button on your Charge HR to cycle through your stats, the first
screen will show a low battery icon if there is approximately one day or less of
battery life remaining.
If you want to receive a mobile notification or email when your battery is low:
1. Log in to your Fitbit.com dashboard.
2. Click the gear icon in the top-right corner of the page and select Settings.
3. Using the navigation tabs on the left, find Notifications and choose which ones
you would like to receive.
4. Click Save.
