[youtube]http://www.youtube.com/watch?v=I-nmY4DCWrQ[/youtube]
If your Mac's battery does not seem to be good enough to withstand daily use, then those from TheVerge they made a small tutorial that will help you assemble an external battery for MacBooks using only $60 and 10 minutes of your life. The process is complicated and not everyone can assemble their own external battery, but if you know electronics then you can save yourself from purchasing an external battery of this type which costs more than 4 times more.
