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If BMW's choice on batteries and on-board electronics to manage them is wrong, they're going to take a big hit on their 8year/100,000 mile battery warranty. Now, how well they'll be working after that is anyone's guess. And, since the car is useless without functioning batteries, just like an engine rebuilt (which on BMW isn't cheap), you may need to replace them at a fairly significant cost. But, I do expect them to have some residual valuable...the materials in them will provide at least some offset to new ones. The resale value on the car will decrease because of the uncertainty, but is not much of an issue if you decide to keep the car longer. When it is time to replace the batteries, should you keep it that long, at least the aluminum/plastic/cfrp chassis should still be in decent shape, should you wish to do that so I don't consider it a throw-away item.
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