Battery change in Karachi,Pakistan it’s paid or free?

Apple will only replace a battery under warranty if its health declined below 80% within the first 12 months of ownership. Your screenshot demonstrates the phone is no longer within warranty, so the phone is past the first 12 months. Thus, a new battery will be at your cost to replace.

Battery Repair

iPhone Battery & Power Repair

Small phones $49, Large phones $69 pr near equivalent round the world.