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Fitbit Charge HR Teardown with X-Rays


Today we get to teardown the super popular Fitbit Charge HR. This is an elegant and simple smartwatch/fitness band – a major contrast to the exuberance of the Apple Watch. Of course, the tiny display in the Fitbit is no comparison to the gorgeous display of the Apple Watch. Albeit its simplicity, the Fitbit Charge HR packs a lot of technology: full time heart rate monitoring, caller ID, exercise tracking, and wireless syncing. All that with an incredible battery that lasts almost 6 days. I specially like how thin the Fitbit Charge HR, making it an easy accessory to use everyday.

Let’s start by checking out these animations that overlay the x-ray image of the Fitbit Charge HR with its photos:

Top View


Side View

The first x-ray image we took of the Fitbit Charge HR, looking from the top of the device, shows the two large mounting screws on the top of the image. The “G” like structure you see on the center looks like the antenna used to wirelessly sync data. The large IC right below it seems to be communication IC in a QFN package, which by the way has a fair amount of voiding… as you can see in our X-Ray University,  large amount of voids underneath a QFN can lead to excessive running temperatures and shorter IC lifespans.

The Fitbit Charge HR uses a traditional rotary vibration motor, as seen in the following x-ray image. The darker area around the shaft is the weight used to vibrate when the motor is turned on.

This nice image of the heart of the Fitbit Charge HR shows the complex electronics packaged in the device. The larger BGA in the top left of the image shows the main control IC. Those horizontal lines on the center of the image are nothing but the connector used to interface the main board to the display.


Here’s a nice detail of the pushbutton on the side of the Fitbit Charge HR. Note the mechanical reinforcement soldered to the board. That large dark circle on the bottom left is one of the two charging pins. More about that later.

This beautiful image shows a side view of the Fitbit Charge HR, in the exact place where the battery connects to the main board. The battery is the large object on the right of the x-ray with the several horizontal layers. The vibration motor can be seen on the left of the image.

Here’s a very nice image showing the charging pins of the Fitbit Charge HR. Look carefully and you can see the little springs inside the pins, which provide mechanical compliance to the device when Fitbit Charge HR is connected to the charging cable. The heart rate monitor can be seen on the top of the image, while the bottom of the image shows the OLED display.

Hope you enjoyed it, let us know what else would you like to see us teardown.

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