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Announced September 9th, 2014, this device is Apple's first foray into smart wearables. iFixit's repair manuals are applicable to Apple Watch (steel) and Apple Watch Sport (aluminum).
Are Apple watch batteries interchangeable between all the different series? Say I need to replace a 38mm apple watch battery (original), can I use a 38mm battery for series 1 in the original?
**Editing to say that I am 100% sure you can swap batteries between the First Gen and Series 1 Apple watches because I’ve successfully done it countless times.**
I'm pretty confident that you can use a battery from a Series 1 Watch in an Original Apple Watch. The internals between the Original and the newer Series 1 are almost identical. (The processor was about the only change.) In fact, if you order a replacement battery from ifixit.com, the batteries are listed as being compatible with either Watch. Also, the details about the used OEM batteries listing even says that they are taken from either an Original or a Series 1 Watch.
Apple Watch (38 mm, Original & Series 1) Replacement Battery
Apple Watch (38 mm, Original & Series 1) OEM Battery
Series 2 is different though and cannot be used in the earlier models.
Product
$15.99
Product
$14.99
Rep: 1
Past 24 Hours: 1
Past 7 Days: 2
Past 30 Days: 6
All Time: 99
1 
153 
693 
