I consider my Apple Watch to be a very vital asset in my life. So, when I see the battery misbehaving, an unknown fear starts taking over my brain and my body. However, the signs to know whether you need a battery replacement or not are always there.

I will also guide you on when to replace the Apple Watch battery.
When Should You Replace Your Apple Watch
You’ve had your Apple Watch for over 2 Years
Before getting into the technical signs, I would like to tell you the most obvious sign, which is the longevity of your Apple Watch. If you have had your Apple Watch for over 2-3 years now, then it is normal for its battery to function poorly.
Battery degradation is very common in any product, and the same goes for the Apple Watch. If you are someone who relies on their Apple Watch a lot for their daily activities, then expect the battery to be out of its potential within 2 years or so.
The Battery Does Not Last A Day
When I got my Apple Watch, I was expecting it to stay active for at least 18 hours or maybe longer, depending on the usage. However, I was shocked to see the performance when the battery started getting ruined.
My Apple Watch battery would not even last half a day, and this is when I realized that it is high time for a battery replacement. If you have been seeing signs that your Apple Watch does not last for a single day, then no, it’s not normal, and you need to get a battery replacement.
The Apple Watch Is Swollen
Notice how your phone starts swelling on the back when the battery is damaged. Similarly, your Apple Watch can start getting swollen, too, if the battery is damaged. Since you will always be wearing it on your hand, it is easy to depict.
Even when I am not wearing my Apple Watch, the swollen battery is so clearly visible that I never have second thoughts about replacing the battery. Swollen Apple Watch batteries are unsafe; hence, it would be best if you replace them as quickly as possible.
Battery Health Is Below 80%
Apple itself says that if your battery health is below 80%, then you need to replace it. So, how do you get to know it? Well, I am going to share two tricks on how you can find your Apple Watch’s battery health without much hassle.
The first trick is to go to your Apple Watch. Then click on Settings, followed by Battery > Battery Health. There, you will see the battery health option. If you see that the battery health is below 80%, then you need to replace it.
Battery Died Unexpectedly
So we have all heard the good things about Apple Watches, that they should last for at least 18 hours, but my Apple Watch battery drains rapidly all of a sudden. Even when I have it charged fully, there are times when the battery drops unexpectedly.
No, you might expect that I am doing some activity on my Apple Watch, which is the cause of this. However, even when I am not doing anything on my Apple Watch, the battery drops below average. If you are experiencing the same issue, it is a sign that you may need to consider a new Apple Watch.
How To Change an Apple Watch Battery
If you have finally made the bold decision to change your Apple Watch battery. Then, in this section, I will tell you how you can do it. If you are a little bit tech-savvy, then you can do it on your own by removing the screws on the back, or you can also do it by opening the snapback.
If I were in your shoes, I would only let the professionals fix it.
Since it’s an Apple Watch, it is expensive, but you can certainly look out for deals. If you are lucky and you are facing problem number 4, then AppleCare will fix it for free. Yes, you heard it right. If your Apple Watch battery health is below 80% then you are eligible for a free battery replacement.
Wrapping Up
I like to use my Apple Watch in low power mode and prevent my apps from running in the background. Simple hacks like reducing brightness and avoiding unnecessary charging can also be of great help. Now you know when to get your Apple Watch battery replaced and how to do it. Hopefully, this will help you keep your Apple Watch battery in good health for a longer run.