I phone 6s battery price

It is $69 (US) for a new battery and make sure you only get it done at Apple or Authorized Apple Service Center.

$69 (U.S.) at the Apple Store.....make an appointment......or take the phone to an authorized Apple service shop.

You can find a list of authorized service shops in your area using this link:

Find Locations

try

iPhone Battery Repair & Replacement - Apple Support