Aye. Do you find in your part of the world that it shuts down a lot in the cold?
It has happened a few times, often at about 70% battery then suddenly it’s dead. If course always when you really need it.
Free battery replacement maybe?
https://www.hotukdeals.com/deals/apple-are-replacing-iphone-6s-battery-for-free-if-unexpected-shut-down-2913329
https://www.apple.com/support/iphone6s-unexpectedshutdown/
Has it ever been replaced? There were a few batches that you could get a free replacement as it suddenly shutting down even though had battery was a known problem. Cant remember if it was 6 or 6s, I just know my old work phone was eligible
Edit- what duncs said
@kboy started
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Aye. Do you find in your part of the world that it shuts down a lot in the cold?