The latest MacBooks do offer a decent battery life. But with this Plug & Charge Macbook Battery, you can add 4 hours of juice to your laptop. This is not a bulky product, so you can take it with you. All you need to do is use your Apple cord and adapter to charge your Macbook and the battery at the same time. I would love for the battery to be even more compact. At the same time, something like this might prove quite useful for business professionals who are always on the go.