UK iStore refusing to replace battery
The battery in my wife's iPhone 6S is hopeless - we've done ALL of the things recommended including factory reset, switching off background refresh etc. etc. but it still plummets overnight or after using it for a few minutes. The battery health shows 83%.
She is happy to pay for a new battery (it's that or a new 'phone), so we made an appointment via Apple's website and she took it in to the store (iStore in Colchester) - they ran diagnostics on the 'phone and said everything was fine, and then refused to replace the battery because according to them Apple do not allow batteries to be replaced unless the battery health is showing < 80%.
Is this true? All I can find is that if you have AppleCare+ then batteries will be replaced free of charge if < 80%. We don't have AppleCare+ and want to pay for a new battery.
iPhone 6s