can i replace an iphone 6s battery, or should I buy a new phone?

Hey There 🙋🏽‍♂️

You always have the possibility to change your iPhone’s Battery. You just have to schedule that in your Local Apple Store, you can also do that through “Apple Support” App or just by contact Apple Support

Also here are the prices with the 6s being at 49$: https://support.apple.com/iphone/repair/service/battery-power

Hope this helps !

Best,

Aryan

it's up to you, if it was me then I would get a new one as it's pretty old

iPhone Battery Replacement - Official Apple Support