iPhone 6s Plus off at 49% of battery
My iPhone 6s Plus switched off at 49% of battery and it will show battery low after turn it on
iPhone 6s Plus, iOS 14
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iPhone 6S Plus is 7 years old, having the battery replaced by Apple or an Apple Authorized Service Providers may resolve the issue.
The battery can be replaced by Apple or an Apple Authorized Service Provider.
See this Apple article:
https://support.apple.com/iphone/repair/service/battery-power
If you are going to replace the battery, read this Apple article:
Get your iPhone, iPad, or iPod touch ready for service