How to Replace the Battery in Apple Watch Series 5

The Apple Watch Series 5 is a reliable smartwatch, but its battery degrades over time. If your watch can’t hold a charge or dies quickly, replacing the battery can restore its performance. This guide explains when to replace the battery, your options, costs, and a step-by-step DIY process. Whether you choose professional service or a DIY approach, you’ll find clear, actionable steps to keep your watch running smoothly.

When to Replace the Battery

Before replacing the battery, check if it’s necessary. Apple recommends replacement when the battery’s maximum capacity falls below 80%. Here’s how to check:

1. Open the Settings app on your Apple Watch.
2. Tap Battery, then Battery Health.
3. Note the Maximum Capacity percentage.

Other signs you need a new battery include:

• Battery lasting less than a day.
• Rapid drain during normal use.
• Swelling, which may push the screen out.

If you see these issues, it’s time to act.

Options for Battery Replacement

You have three main options for replacing the battery: Apple’s professional service, third-party repair shops, or a DIY approach. Each has pros and cons.

Apple’s Professional Service

Apple offers an official battery replacement for $79 (out of warranty) as of July 2025. Instead of replacing the battery, Apple provides a refurbished watch with a new battery. If you have AppleCare+ and the battery is below 80% capacity, the service is free.

• Advantages:
  • Uses genuine Apple parts.
  • Maintains water resistance and functionality.
  • Does not void warranty.
  • Takes 3-5 business days.
• Disadvantages:
  • More expensive than other options.
  • Requires shipping, leaving you without your watch temporarily.

Visit Apple’s Service and Repair page to schedule.

Third-Party Repair Services

Third-party shops charge $30-$60 for battery replacement, depending on the provider. Some offer same-day service, but non-Apple parts may be used.

• Advantages:
  • Cheaper than Apple’s service.
  • Often faster, with local options.
• Disadvantages:
  • Non-genuine parts may affect performance.
  • Voids Apple’s warranty.
  • Quality varies by provider.

Choose a reputable shop to avoid issues. Check reviews before committing.

DIY Battery Replacement

Replacing the battery yourself costs $20-$30 for parts, plus tools if needed. It’s the cheapest option but requires skill and risks damaging the watch.

• Advantages:
  • Lowest cost.
  • Full control over the process.
• Disadvantages:
  • High risk of damaging delicate components.
  • Voids warranty.
  • Requires specialized tools and experience.

Step-by-Step DIY Battery Replacement

If you choose DIY, follow these steps carefully. The process is complex, so proceed with caution.

Tools and Parts Needed

• Pentalobe screwdriver.
• Spudger.
• Plastic opening tools.
• Heat gun or hair dryer.
• Replacement battery for Apple Watch Series 5 ($20-$30).
• Adhesive strips or Tesa 61395 Tape ($5-$13).
• Tweezers.
• Safety glasses and gloves.

Steps

1. Prepare Your Workspace:
   • Work in a clean, well-lit area.
   • Power off the watch and remove bands.
   • Discharge the battery below 25% to reduce fire risk.
2. Heat the Display:
   • Use a heat gun or hair dryer to warm the screen for 2 minutes to soften adhesive.
3. Open the Watch:
   • Insert a plastic opening tool or curved blade into the gap near the digital crown.
   • Pry gently, avoiding the force touch sensor. Don’t insert the tool more than 2 mm.
4. Separate the Force Touch Sensor:
   • If the sensor sticks to the display, use an opening pick to separate it carefully.
5. Lift the Display:
   • Lift the screen like a book, avoiding strain on cables.
6. Disconnect Cables:
   • Use a spudger to disconnect the display and battery cables.
7. Remove the Old Battery:
   • Insert an opening pick between the battery and Taptic Engine to loosen adhesive.
   • Apply more heat if needed, then lift the battery out carefully.

8. Install the New Battery:
   • Place the new battery, aligning it with adhesive locations.
   • Secure with adhesive strips or tape.
9. Reassemble the Watch:
   • Reconnect cables.
   • Apply new adhesive to the display and seal the watch.
10. Test the Watch:
    • Power on and check the screen, apps, and connectivity.
    • Calibrate the battery: charge to 100%, discharge fully, then charge to 100% again.

Safety Precautions:

• Wear safety glasses and gloves.
• Avoid puncturing or bending the battery.
• If the battery is swollen, seek professional help immediately.

Cost Comparison

Should You Replace or Upgrade?

Consider these factors:

• Cost: Battery replacement ($30-$79) is far cheaper than a new watch (e.g., Series 10 at ~$399).
• Features: Newer models have larger displays and advanced health features like sleep apnea monitoring.
• Condition: If your Series 5 works well otherwise, battery replacement is cost-effective.

A Reddit user replaced their Series 5 battery for $79 and received a refurbished watch with 92% battery health, extending its life. Another upgraded to a Series 10 for better performance and gave their Series 5 to a family member.

Maintaining Battery Health

To extend battery life:

• Avoid extreme temperatures (below 32°F or above 95°F).
• Keep charge between 20% and 80%.
• Update watchOS regularly.
• Avoid full discharges or constant 100% charge.

Frequently Asked Questions

Conclusion

Replacing the battery in your Apple Watch Series 5 can save money and extend its life. Apple’s service is reliable but costly, third-party repairs are affordable but riskier, and DIY is cheapest but challenging. Check your battery health and follow maintenance tips to make the best choice.