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I mean, they're letting you buy the damn thing, so once you purchase it, you can see if it holds up.
Yes, snake oil salesmen are usually happy to let you buy some snake oil.
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Go for Apple then, custom batteries, not user-replaceable, not retailed. They'll sign you a check for $10bn instead.
Fair enough I could see Apple doing this. Although if batteries last as long as indicated here they would have to up the cost nearly twice as much per battery to keep profits steady.
All in all, I don't think they'd care. Their biggest business these days is phone & tablet, and battery life (and the failure thereof) is not the primary upgrade driver.
Would this be useful for Tesla?
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The ThinkPad x240 is thinner and lighter than a MacBook Pro and still manages to find space for an external battery, an RJ45 jack, and a VGA connector.
Its not thinner. The x240 is 0.8 inches thick [1] and the MacBook Pro is 0.71 inches thick. [2] Not trying to fanboy here having used both of those laptops recently. [1] http://www.laptopmag.com/reviews/laptops/lenovo-thinkpad-x24... [2] http://www.apple.com/macbook-pro/specs-retina/
Maybe this feature was a bit underreported: the current line of Lenovo 's Ultrabooks, the ThinkPad X240/T440s allows for hot swapping the battery pack while running on a secondary built in battery. Adding up to 23.5 Whr built in plus up to 72Whr per battery pack. http://shop.lenovo.com/us/en/laptops/thinkpad/t-series/t440s...