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COROS APEX FAQs & SpecsUpdated 2 years ago

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Why does my APEX freeze watch freeze and restart when it scrolls through widgets?

Due to a recent bug resulted from incoming phone call notifications from select Android phones, the COROS APEX watch will freeze and restart when the user scrolls through the widgets on the main watch face and tries to get to the notification widget. 

Affected users please contact [email protected] and provide the 6 digit watch ID or 10-digit SN to receive a new firmware to fix this issue.

Or you can follow the steps below to fix the issue temporarily. 

  1. On the COROS app > Device page > Notifications > Disable Phone Calls.
  2. Reset the watch

Battery Usage and Optimizations

Battery Usage Tool

Built into every COROS watch is a "Battery Usage" tool that allows you to view on-demand usage reports on the consumption of your watch battery during the current charging cycle. 

  • To access the Battery Usage tool, hold the back button to access the Toolbox, then scroll until you find "Battery Usage" (see photo below)

The Battery Usage tool will then display a graph that shows you the current battery percentage of your watch, a graph showing your historical battery drain, when your last charge was, and the estimation of how long your battery will last based on "standard use".

To view a more in-depth breakdown of the battery usage statistics, press the digital dial.

From this screen you can see the following metrics: Remaining Power, Estimated Daily Use Left, Estimated Max Daily Use Left, Estimated GPS Use Left, Last Charge, Since Last Charge. You will also find the most common features which cause battery drain here, and what percent of your recent battery drain can be attributed to these common features. Below is an explanation of each of the common features which consume battery:

  • System - Normal operating activities. Any type of regular maintenance on the watch or features that are vital to maintaining a functional watch (i.e. keeping the clock up-to-date) will fall within the "System" category
    • Notifications - Any notifications which are pushed to your watch, both for workout alerts (lap alerts, etc.) and daily notifications (calls, text messages, etc). This is displayed as a number rather than being included in the overall percentage estimate.
  • GPS Workouts - Any activity recorded which uses GPS signals to measure and record distance, etc.
  • Backlight - Any power used to illuminate your watch screen. The more you use your backlight (Night Mode, Backlight Gesture, etc.), the higher this percentage is likely to be.
  • Daily Heart Rate - Measurements taken that consume battery to provide daily heart rate data. You have the ability to specify this to "Real-Time" or "Every 10min"

Please keep in mind that when these measurements are shown as a percentage, they will also add up to ~100% (excluding rounding instances). This means that, theoretically, if you charged your watch within the last 10 minutes, your "System" use could equal 100% if you have not received notifications, used the backlight, etc. This is completely normal to see.

It's also important to highlight that this tool is an estimator and should not be used as absolute truth. If your battery usage report shows an error such as "Since Last Charge: 3 Days", when in reality you had charged 14 days ago, please ensure all activities are uploaded from your watch to the COROS app, then perform a reset of your watch. 

  • Hold the back button to open the Toolbox -> System -> More Settings -> Reset All

Battery Optimizations

To prolong the battery life on your COROS watch, there are a few things settings you will want to keep an eye on. To maximize battery life, you will want to minimize the number of times in daily use that your watch records your heart rate, turns on the backlight, and receives notifications. The frequency in which you choose to use these features makes a big impact on how long your battery will last, here are the settings which will give you the most battery life:

  • System -> Sensors -> Optical HR -> Daily HR -> Every 10 min.
  • System -> More Settings -> Backlight -> OFF
  • Open the COROS app -> Device Page (4th tab at the bottom) -> Notifications -> Off (or select the few options which are most vital)

Other Frequent Causes of Battery Drain

In the real world, battery performance is by a variety of factors. Things like the strength of your GPS signal or setting up your watch can impact the amount of battery the watch is using.

Activity alerts and vibrations can consume a significant amount of battery, and the more frequent these are the more of an impact they have on battery life. To maximize battery life, try reducing the number of vibrating alerts you get throughout your run/workouts to as few as possible. In addition, each alert during workouts turns on the backlight for a few seconds, which also will greatly reduce overall battery life.

Using navigation features also consumes an additional ~10% battery from your watch as compared to normal GPS use. If navigation is being used, but you only scroll to the navigation page periodically, this will most likely put your battery performance back to the normal range as compared to viewing the navigation page for the entirety of your workout.

Where can I find the COROS APEX User Manual?

Click here to see the COROS APEX manual.


Click here for more FAQs on COROS APEX.

COROS APEX Product Specifications

  • Display Size
    • 46mm: 1.2 in. 240 x 240 (64 colors)
    • 42mm: 1.1 in. 218 x 218 (64 colors)
  • Display Type: Memory LCD
  • Screen Material: Sapphire Glass
  • Bezel Material: 46mm
    • Titanium Alloy
    • 42mm: Stainless Steel
  • Strap Material: Silicone
  • Quick Release Bands:
    • 46mm: 22mm
    • 42mm: 20mm
  • Physical Size
    • 46mm: 46 x 46 x 11.9 mm
    • 42mm: 42.00 x 42.00 x 11.75 mm
  • Weight With Silicone Band
    • 46mm: 55.3 g
    • 42mm: 49 g
  • Weight With Nylon Band
    • 46mm: 45 g
    • 42mm: 38 g

Click here to see full APEX product specs.

Have a technical issue with a COROS GPS watch? We'll help you get it figured out!

The first step we recommend is contacting COROS's fantastic support team directly — this can be done in three ways:

As an Authorized COROS Dealer, all COROS smartwatches sold on are completely eligible for COROS's 2-Year Manufacturer Warranty. So you can be confident you'll be protected from any product defects within 2 years of your delivery date!

When you purchase a COROS product on, you have 60 days to return or exchange it—no questions asked!

The team is here to support you the entire way! So if you're not getting the help you need, please contact us via the Chat feature and we'll make sure you are completely taken care of.

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