Apple Watches are impressive little computers, but they don’t last forever. Over time, the battery starts to die, which can ruin your chances of closing your daily rings. Additionally, the watch starts to slow down, to the point where you might think you’d be better off upgrading to the next-gen Apple Watch. But instead of buying a whole new watch, you should consider simply replacing the battery.

It may not be obvious from its inaccessible design, but the Apple Watch is perfectly suited for a battery replacement when the time comes. It’s the same story as your other rechargeable devices: All lithium-ion batteries degrade over time, resulting in both reduced capacity and reduced performance. As your Apple Watch ages, you’ll be able to use it less between 100% charges, and it won’t work as well as it once did.

For most people, this combination is a sign that it’s time for an upgrade: Apple conveniently refreshes the Watch once a year, always offering an improved version of your device to purchase when you need it. When your device just can’t keep up with the times and breaks before the end of the day, why not upgrade to something better?

Because you probably don’t need to. Sometimes, swapping out that old battery is all you need to keep an old Apple Watch running. A new battery will obviously give you longer battery life, but it can also better support your Apple Watch’s hardware, improving performance all day long.