MacBook Unibody Model A1342 Teardown
Quote from Solipsism:
Apple doesn’t want you removing the battery yourself so it can be disposed on properly.
There is plenty of infrastructure for recycling user replaceable batteries in any country where people can afford to buy apple hardware. Requiring two different tools just to replace a battery that definitely will not last any significant international flight or workday is indisputable handicapping. The very minimum battery life where it starts to become acceptable is >10 hours rated, which would probably get you 7-8 hours actual use. At least then you could make it through a days work.