When Should You Charge Your Fitbit?


If you’ve just gotten your hands on a brand new Fitbit, then congratulations! However, how long your device lasts is majorly dependent on how you care for its battery. A degraded battery will affect two major components your battery capacity and device performance. So when should you be charging your Fitbit?

Ideally, you would want to charge your Fitbit to maintain a 75% to 25% charge cycle. This is because Fitbit’s feature lithium-Ion batteries which degrade at a faster pace every time your device drops below 20% or goes over 80%. A 75% to 25% charge cycle has been shown to be the most efficient in preserving optimal temperature levels, as well as reducing battery stress from discharges and overcharges.

Let’s dive in a little deeper on the topic and unveil best practices on maintaining a prolonged battery lifespan.

When Should You Charge Your Fitbit?

Fitbit’s like most modern devices, use Lithium-Ion batteries, which work in charge cycles. A charge cycle is when your device consumes equal to 100% of its battery life. Every device has a limited number of charge cycles until the battery is completely degraded.

Your device slowly degrades every time it consumes a charge cycle. This affects to main components of your device, your battery capacity, and device performance. This can result in longer app launch times, lower frame rates, reduced wireless data throughput, screen dimming, lower speaker volume.

There are three main culprits that are responsible for Lithium-Batteries to degrade faster than they should.

These are charge cycles, environmental temperatures, and the Battery percentage of your stored device.

We’ll start with charge cycles.

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A charge cycle is when you consume equivalent to 100% of your device’s battery. However, there are two main things you need to know. The first is every time you’re device drops below 20%, you consume one charge cycle, and every time you’re device goes over 80%, your device will endure additional stress resulting in your battery to chemically age over time.

So what’s the ideal charge cycle?

According to a test done by battery university, 75% to 25%, this charge cycle had the second-best results when it comes to maintaining battery health.

The best being a 75–65% charge cycle. However, since this is only a 10% battery capacity, it’s not a practical charge cycle.

Additionally, the study shows a charge cycle from 100–25% Has a significantly shorter lifespan.

Enviromental Tempratures & Storage

The second thing you’ll need to be aware of is the environmental temperatures you expose your Fitbit too. Lithium-Ion batteries don’t perform well in extreme temperatures; whether it’s too cold or too hot, this can cause it to lose significant battery capacity.

Here are Fitbits recommended operating temperatures 14° to 113° F (-10° to 45° C). For more information, you can take a look at Fitbit’s official website.

The third factor that has a significant impact on your battery’s health is the battery percentage in which your device s stored. If you decide to store your device for a few days, then you should know that Lithium-Ions batteries should never be stored at 100% battery. This is because, as mentioned above, Lithium-Ion batteries don’t perform well in extreme temperatures. Having your device stored at a high battery percentage can increase your battery’s temperature causing your Fitbit’s battery to become unstable.

Battery university shows the impact of extreme temperatures when your device is stored at 100% battery. After three months of storing your device at 100% battery at 40°C, your apple watch will only retain 65% of its battery capacity. If the Apple watch is stored at 40% battery at 40°C, it will retain 75% of its battery capacity.

How long does Fitbit battery last?

Here is how long your Fitbits should last, according to Fitbit. However, several factors affect how long your device actually lasts; this includes optimized performance settings, prolonged usage…etc

DeviceBattery Life
Fitbit Sense*
Fitbit Versa 2*
Fitbit Versa 3*
around 6 days
Fitbit Versa
Fitbit Versa Lite Edition
around 4days
Fitbit Ace 3
around 8 days
Fitbit Inspire 2
around 10 days
Fitbit Ace and Fitbit Ace 2
Fitbit Alta
Fitbit Blaze
Fitbit Charge 2
Fitbit Flex 2
Fitbit Ionic*
Fitbit Inspire series
Fitbit Luxe
around 5 days
Fitbit Alta HR
Fitbit Charge 3
Fitbit Charge 4*
Fitbit Charge 5*
around 7 days
Fitbit One
around 5 days
Fitbit Zip
around 2 weeks
Fitbit Flyer
around 6 hours

Is it OK to charge Fitbit overnight?

There is no issue with charging your Fitbit overnight; this is because Lithium-Ion batteries are optimized to stop charging once the device is fully charged. So leaving your charger plugged into your device will have no impact on its battery health.

How do I make my Fitbit battery last longer?

There are a few things you can do to increase your Fitbit’s battery life. Let’s take a look:

  • Turn off notifications: calendar, texts, & call notifications can impact how fast your Fitbit’s battery drains. Turning it off when notifications aren’t necessary can help save a few minutes of battery life.
  • Turn off alarms: alarms do impact battery life. Turn off any unneeded alarms.
  • Turn off heart rate monitor: the heart rate monitor feature is another task that runs in the background, which drains additional battery. Simply turning it off when it’s not required can offer a significant boost in battery life.
  • Turn off All-Day sync: All-day sync has a massive impact on battery life as it constantly transfers data in the background. This is another feature that is best turned off when not in use.
  • Turn off Quick View: Last but not least, we have Quick View. Although a handy feature. Quick View can rapidly drain your device’s battery as it automatically turns on when you pull your arm towards yourself. Turning this off will result in additional battery life.

Steven Carr

Steven is a certified IT professional and gaming enthusiast. He has been working in the tech industry for over 10 years, and specializes in all things Tech-related. When he's not geeking out over the latest hardware or software release, he can be found testing out the latest video game.

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