Iphone Warrranty

Batteries can be replaced under warranty if they fail, or fall below certain capacity within the warranty period.

However, warranty is only valid in the country the iPhone was purchased.

You may be able to get the battery replaced in Canada, but it will not be under warranty.

See here: iPhone Battery Replacement - Official Apple Support USA

and here: iPhone Battery Replacement - Official Apple Suppor Canada

It's rather complicated because of the way cellular communications devices are distributed and how Apple does serious warranty repairs as replacements. The warranty terms for iPhones always notes that warranty service may be restricted to the country of original purchase. However, batteries and screen assemblies are universal parts regardless of country, so it might be possible to get one repaired under warranty in another country.

However, battery replacement isn't covered as a warranty item unless the battery is "defective". If something happens such as the battery failing or severe loss of capacity (80% is the standard) during the warranty period, it may be replaced under warranty, even if it's in another country. If the battery swells, then that would likely damage the device and that's a bit different because it's not a simple part to be replaced.

However, Canada is close enough to the US that it's possible to get it repaired in the US.

Batteries are not covered by the warranty.

They are consumables and you buy your next one if needed.

y_p_w wrote:

However, Canada is close enough to the US that it's possible to get it repaired in the US.

It could be fixed in the US except travel between Canada and the US is temporarily halted except for emergency situations.