An alternate interpretation: you can easily find cheap USB power supplies to put everywhere. While the long life per charge is great, the battery will be in a l

An alternate interpretation: you can easily find cheap USB power supplies to put everywhere. While the long life per charge is great, the battery will be in a lot better shape three years down the line if it is almost always plugged into some 12W power supply regardless of where you're using your computer. Buying multiple MagSafe-equipped 65W or 85W chargers to put in every room where you use your laptop gets expensive quickly.