I still fire up my first generation 13-inch Intel-based MacBook now and then to update software (it is now stuck forever with Snow Leopard as its OS, however) and check its battery – the original one. At age 75 months (6 years, 3 months), it still is (a) working and (b) has a respectable 79% of its original charge capacity according to the coconutBattery meter. The MacBook itself is still surprisingly useable for something with a “mere” 2GHz CoreDuo processor, 1GB RAM, and a 60GB hard drive.