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How do I charge my tracker?

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We recommend plugging your charging cable into a USB port on your computer or other low-energy device. If necessary, you can use a UL-certified USB wall charger. Don't use a USB hub or battery pack to charge, and only use the charging cable that came with your tracker.

For charging instructions and expectations, choose your tracker model below.

Your Fitbit Alta comes equipped with a rechargeable lithium-polymer battery. If your battery is low, charging fully may take one to two hours.

Charging Instructions

To charge your Alta:

  1. Plug the charging cable into the USB port on your computer.
  2. Plug the other end of the cable into the port on the back of the Alta.
  3. By lining up the pins on the charging cable with the port on your Alta, attach the cable to the tracker. These must be securely locked in place.
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  4. To verify that charging has started, make sure you see a battery icon on Alta's display. When you disconnect your charging cable from your tracker, you'll see a message letting you know the tracker is no longer plugged in.

To see these steps in action, watch the following video (English only).

Monitoring battery level

For help deciding when to charge your tracker:

  • Your battery level is visible at any time on your Fitbit dashboard. To add a battery indicator that appears each time you flip through your stats on Alta, see How do I change the stats on my tracker?
  • When one day or less of battery life remains, you'll see a battery icon on the first screen while flipping through your stats.
  • When a critically-low warning appears, charge as soon as possible. 
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  • To receive a push notification or email when your battery is low, update your Notification settings on fitbit.com. For instructions see How do I update my Fitbit settings?

Your Fitbit Blaze comes equipped with a rechargeable lithium-polymer battery. If your battery is low, charging fully may take one to two hours.

Charging Instructions

To charge your Blaze:

  1. Plug the charging cable into the USB port on your computer.
  2. Remove the tracker from the wristband. To do so, push the screen gently so that it detaches from the frame.
  3. Put the tracker inside the charging cradle with the screen facing towards you and the four gold prongs aligned.
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  4. Close the cradle cover. A large battery icon appears temporarily on the display to let you know that charging has started.
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While your tracker is charging, a small battery icon in the top left corner while charging so you can check progress. A large green battery icon means the battery is full.

To see these steps in action, watch the following video (English only).

Monitoring battery level

The battery icon in the top left corner of your Blaze screen represents remaining battery life as of the last sync. You can also find this icon on the Fitbit dashboard.

If you want to receive a push notification or email when your battery is low, update your Notification settings on fitbit.com. For instructions see How do I update my Fitbit settings?

Your Fitbit Charge comes equipped with a rechargeable lithium-polymer battery. Charging completely takes between an hour and two hours.

To charge your tracker, plug the charging cable into the USB port on your computer and plug the other end into the port on the back of the Charge. A battery icon on the display will show the charging progress. 
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Your Fitbit Charge 2 comes equipped with a rechargeable lithium-polymer battery. Charging fully takes about one to two hours.

Charging Instructions

To charge your tracker:
  1. Plug the charging cable into the USB port on your computer or a UL-certified USB wall charger. 
  2. Clip the other end of the charging cable to the port on the back of the tracker. The pins on the charging cable must lock securely with the port. 
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  3. Make sure the button on your tracker is aligned with the button opening on the charging cable. You’ll know the connection is secure when the tracker vibrates and you see a battery icon on your tracker’s display. The battery icon disappears after three seconds.

While the tracker charges, you can tap it to check the battery level. A fully charged tracker shows a solid battery icon.

Monitoring battery level

For help deciding when to charge your tracker:

  • Check your battery level at any time on your Fitbit dashboard.
  • When one day or less of battery life remains, you'll see a battery icon on the first screen when checking your stats.
  • When a critically-low warning appears, charge as soon as possible. 
  • To receive a push notification or email when your battery is low, update your Notification settings on fitbit.com. For instructions see How do I update my Fitbit settings?

Your Fitbit Charge HR comes equipped with a rechargeable lithium-polymer battery. Charging completely takes between an hour and two hours

To charge your Charge HR, plug the charging cable into the USB port on your computer and plug the other end into the port on the back of the Charge HR. A battery icon on the display will show the charging progress.


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Fitbit Flex comes equipped with a rechargeable battery. Charging fully may take up to 3 hours.

  1. Remove the pebble from the wristband: 
  2. Line up the pebble with the charging cable, putting the rounded end of the tracker into the charging cable at a slight angle. Use your thumb to push the pebble in and down into the charging cable until you hear a click.

  3. Insert the charging cable into the USB port on your computer. Your Flex's LED indicator lights will pulse to show the battery level every few seconds. Each solid indicator light represents progress towards the total charge. When it's charged, all 5 indicator lights will blink.
  4. Remove the pebble from the charging cable and put it back in the wristband. 

Fitbit Flex 2 comes equipped with a rechargeable battery. Charging fully takes about two to three hours.

Charging Instructions

To charge Flex 2:

  1. Plug the charging cable into the USB port on your computer or a UL-certified USB wall charger.
  2. Press the pebble into the compartment on the charging cable The pins on the charging cable must align with the corresponding pins on the back of the pebble and lock securely in place. You’ll know the connection is secure when the pebble vibrates and you see the indicator lights blinking.
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While Flex 2 charges, each white light represents 25% of the maximum charge. When fully charged, you’ll see a green light and then all five lights will shine for a few seconds before turning off.

Monitoring battery level

To check your battery level at any time, look at your Fitbit dashboard.

To receive a push notification or email when your battery is low, update your Notification settings on fitbit.com. For instructions see How do I update my Fitbit settings?

To charge your Fitbit One, align the gold contacts on your tracker with the gold contacts on the inside of the charging cable, then plug it into your computer’s USB port. Charging typically takes about an hour.

A battery indicator will appear when the Fitbit One is first plugged into the charging cable. You can hold down the tracker’s button while it is charging to see its current battery level. You can also see your One tracker's battery level at the time of your last sync by clicking on the gear icon in the upper right corner of your dashboard.

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Your Fitbit Surge comes equipped with a rechargeable lithium-polymer battery. Charging completely takes one to two hours.

To charge your Surge, plug the charging cable into the USB port on your computer and plug the other end into the port on the back of the Surge. 


Plugging charging cable into back of Surge

Battery level is shown at the top left of the Menu. You can also check your battery life on your Fitbit dashboard.

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Last updated: September 25, 2016
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