Not a single day passes since Apple refreshed the MacBook and already the fine folks at iFixit are on the job. For the most part, its full disassembly is business as usual, as only a few components -- CPU, GPU and battery -- have changed since the last go-round. That last is of special interest, however, because iFixit says the battery is exactly the same shape as its former -- all you have to do to get an extra 350 mAh for your existing plastic MacBook is to drop in a refreshed battery. Mind you, the new cells weigh more and it's likely the new silicon that's actually responsible for 10 hours of battery life, but should your Li-ion pack fail under warranty, your older MacBook might be returned with more juice than you'd bargained for. See the full teardown at our source link.