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Apple Watch Series 1 Battery Replacement: Step-by-Step Guide

apple watch series 1
Image: Flickr

The Apple Watch Series 1 remains a popular device even though newer models have since been released. One common issue that users encounter as the device ages is a decrease in battery performance. This comprehensive guide provides detailed information on why you might need your Apple Watch Series 1 battery replacement and how to go about it.

Reasons for Apple Watch Series 1 Battery Replacement

Several reasons might necessitate a battery replacement for your Apple Watch Series 1:

  1. Aging Battery: Over time and with frequent charging cycles, the battery’s capacity reduces. This is a common issue with all lithium-ion batteries and can lead to your Apple Watch holding less charge and requiring more frequent charging.
  2. Battery Swelling: In some instances, the battery might swell. This can cause the screen to pop out or even damage the internal components. If your Apple Watch case is opening due to a swollen battery, Apple has acknowledged this issue and offers free repairs.
  3. Device Malfunctions: If the device is not turning on or experiencing other power-related issues, the problem might be due to a faulty battery.
apple watch series 1 battery replacement
Image: Flickr

Apple Watch Series 1 Battery Replacement Solutions

There are several solutions available if you need to replace the battery in your Apple Watch Series 1:

  1. Apple Service: The best solution for a battery replacement is to go through Apple’s official support channels. You can schedule an appointment with an Apple Store or an authorized service provider. They have the necessary tools and knowledge to replace the battery safely and correctly.
  2. DIY Replacement: If you’re comfortable working with small electronic components and have the necessary tools, you could replace the battery yourself. However, this option is not recommended unless you have experience, as it can easily lead to further damage. You will need to purchase a replacement battery kit online, which comes with the necessary tools and instructions.
  3. Third-party Repair Services: Several third-party repair services can replace your Apple Watch battery for you. However, you should ensure that you choose a reputable service to avoid potential damage or voiding your warranty.

DIY Replacement

Replacing the battery in your Apple Watch Series 1 can be a complex process, and unless you’re comfortable with handling small parts and have the necessary tools, it’s usually recommended to leave this job to the professionals. However, if you decide to proceed, please understand that doing so could potentially void your warranty or damage your device if not done properly.

Before beginning the replacement process, you will need:

  1. A replacement battery compatible with your specific Apple Watch model. You can purchase this online.
  2. A set of precision screwdrivers.
  3. A plastic or nylon spudger to carefully disconnect the connectors.
  4. A suction cup or iSclack to lift the display.
  5. A clean, well-lit workspace.

Apple Watch Series 1 Battery Replacement: Detailed Guide

Here’s a general step-by-step guide on how to replace your Apple Watch Series 1 battery:

  1. Power off the device: Always ensure your device is off before beginning any repair to prevent short circuits.
  2. Remove the display: Attach a small suction cup to the display, just above the speaker. Firmly hold the watch case and gently pull up on the suction cup to open a small gap. Be careful not to lift too hard as you could damage the display cables. Insert a plastic opening tool into the gap, and gently pry around the edges to fully detach the display.
  3. Detach the display cables: Use a spudger to disconnect the two display cables. Lift the screen and remove it from the watch case.
  4. Remove the battery connector: The battery connector is located underneath the metal cover plate. Remove the screws holding the cover in place and then use a spudger to disconnect the battery connector.
  5. Remove the old battery: Carefully pry the old battery out of its adhesive holding using a spudger or plastic opening tool.
  6. Install the new battery: Place the new battery into the watch case and connect the battery connector. Ensure it’s properly aligned and secured with adhesive.
  7. Reconnect the display: Reconnect the two display cables, then carefully align and press the display into place.
  8. Test the device: Power on your Apple Watch to ensure that the new battery is functioning correctly.

Remember to take your time and be patient. If at any point you’re not confident about the process, it’s best to consult a professional or visit an authorized Apple service center.

Disclaimer: This guide is provided for informational purposes only. Proceed at your own risk. Iphone-geeks is not responsible for any damage caused to your device during this process. Always consult with a professional if you are unsure about any steps in the process.

apple watch on table
Image: Rawpixel

Battery Health and Maintenance

To ensure your new battery lasts as long as possible, it’s essential to follow some maintenance practices:

  1. Optimize Settings: Adjust your settings to extend your battery life. This might include reducing screen brightness, turning off background app refresh for non-essential apps, and disabling push email.
  2. Regular Updates: Ensure your watchOS is always up-to-date. Software updates often include advanced energy-saving technologies.
  3. Avoid Extreme Temperatures: Both very hot and very cold environments can affect your battery performance. Always try to keep your Apple Watch in a moderate temperature range.

Apple Watch Series 1 Battery Specs

The Apple Watch Series 1, first introduced in 2015 and refreshed in 2016, features a lithium-ion battery. According to Apple, the battery is designed to retain up to 80% of its original capacity at 1000 complete charge cycles.

While Apple doesn’t officially list the exact milliampere-hours (mAh) of the battery in the Apple Watch Series 1, teardowns and specifications from third-party parts suppliers suggest the 38mm model features a 205mAh battery and the 42mm model a 246mAh battery. However, the actual performance and longevity of the battery can vary depending on various factors, including usage patterns, software version, and overall device health.

Battery life for the Apple Watch Series 1 is rated for up to 18 hours under normal use conditions, which includes checking the time, receiving notifications, using apps, and doing a 30-minute workout.


Although the Apple Watch Series 1 is an older model, its popularity means many users are still looking for solutions to common problems like battery life. Whether you’re dealing with a battery that’s reached the end of its life or one that’s swollen and causing problems, the solutions mentioned above should help you navigate the replacement process. Remember, always ensure that your device is handled by experienced professionals or reputable repair services to avoid further damage.

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