Wes has a six year old MacBook pro and he's ready to upgrade. He's concerned that he can't upgrade the newer versions because of how they're manufactured. Leo says that Apple wanted to get more capacity and battery life. To accomplish that, they sealed the laptop around a huge liquid battery that takes up a lot of room. So users can't upgrade them anymore. It may also be that they don't want people to upgrade their computers, they want them to buy new ones.