How much does Apple Watch 2nd Gen battery cost?
How much is it for a 2nd Gen Apple Watch battery.
[Re-Titled by Moderator]
Apple Watch SE (2nd generation)
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In the US you will have to pay $99.
If your watch is covered by Apple Care+, Apple will replace the battery at no costs.
Have a look at this Apple Watch Service page to get an estimate and click on "Get Service" to start the process: