Batteries are the bane of mobile device makers-companies have to ensure that battery life is sufficient, and just as importantly, are well constructed and won't die prematurely or, even worse, overheat and catch on fire and explode.
Since the Apple Watch's original release in 2015, nearly all of the device's personalization has been tied to the swappable wrist bands. Apple will also fix watches when the display pops out of place due to the same issue.
Customers have three years from the original date of purchase to take advantage of the free fix, after which they'll have to pay for the service (£82.44 in the UK).
According to the document, "some" Apple Watch Series 2 models will not power on or exhibit swollen batteries "under certain conditions". The free fix only applies to Series 2 watches in the 42mm variant and that includes all models of this watch.
Apple released the Apple Watch Series 2 in September of 2016, so the oldest models at this point are around 19 months old. There were reports of some employees not being aware of the new policy.
In a rumoured, decidedly un-Apple move, it looks like the Big A could be about to let third-party developers design faces for the Apple Watch. While not a widespread issue, battery swelling can cause power interruptions, operational issues or, in some cases, dislodged displays. It is also important to note that the length of time for the service is three years from the time of purchase.