Let’s face it, the default battery indicator on MacBooks is pretty boring. If you want to liven it up a bit, consider the terminally cute (and free) app Battery Buddy by Neil Sardesai. This indicator shows your MacBook’s battery charge using cute smiley faces. Fully charged, the indicator smiles at you, but he grows less happy and more sad as your battery drains. When you plug in, your little battery buddy gets a charging icon next to him.
Check It Out: Battery Buddy Makes Charging Your MacBook More Fun