Use your old Magsafe Adapters for your new Macbooks.
The MagSafe to MagSafe 2 Converter allows you to use the MagSafe connector on your LED Cinema Display, Thunderbolt Display, or MagSafe Power Adapter to charge your MagSafe 2-equipped Mac computer.
https://www.apple.com/au/shop/product/MD504ZM/A/magsafe-to-m…