Upgrade my battery power please

No way to upgrade / increase your battery status. It's a consumable.

You can just: have your battery replaced, if its maximum capacity is close to 83-80%, or try to slow down its degradation using these suggestions:--> Batteries - Maximizing Performance - Apple

Regards

Giulio

Cost to replace the battery is $89 (U.S.)

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