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Battery life and power
Battery life
Your Flex comes equipped with a rechargeable lithium-polymer battery.
With normal use, your Flex should last about five days before needing a charge. You
can check the level of your battery by logging in to Fitbit.com and clicking on the
gear icon on the top-right corner of the page.
You can also view the battery level using the iOS or Android app on the Devices
screen.
Charging your Flex
To charge your Flex, plug the charging cable into the USB port on your computer.
Remove the tracker from the wristband, and insert it into the charging cable, with the
LED indicator lights facing up.
The LED indicator lights will progressively illuminate on your Flex as it charges. Each
light represents 20% of the maximum charge. Once all five lights are solidly lit, your
Flex will be fully charged. Charging completely can take up to three hours.
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