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Old 12-06-2012, 12:46 AM   #27
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Join Date: Sep 2006
Location: California
Posts: 2,109
My Ride: M3
I would imagine they use pretty much the same 18650 Li-Ion cells that you find in a laptop battery. From my experience, a good quality Sanyo laptop battery pack under normal use had about 40% of its capacity after 3 years and just couldn't deliver capacity or power-wise. In general, it is not uncommon for Lithium Ion batteries to degrade 2 years from the date of manufacture, regardless of use. It's simply due to corrosion and chemical breakdown in the cell and I don't see how the Tesla batteries would be exempt. The life can be extended by careful charge routines, proper cooling, min/max voltage limits and cell balancing, but yes, much less than 8 years. The crappy thing is that performance will diminish gradually so it's not so easy to tell when you aren't getting the most out of your car.

Look at that subtle jet-black coloring. The tasteful thickness of it. Oh my God, it even has a 6mt.
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