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So there was something wrong with the assembly. So much for trying to make things modular; apparently that caused it to fail.
300,000 miles in 3 years is not a normal use case, but there's no other way. There are no 10 year old packs made in 2015 yet. The factor age had not been sufficiently tested as there is no way to speed up time.
The other 2 factors that do influence battery life - heat and mileage - have been tested, and most packs have passed that test with flying colors.
If a Tesla battery fails, it is highly unlikely to be due to faulty cells.
Because those cells are tiny, and grouped in series of 47 each with a lead that acts as a fuse. If a cell shorts it will blow its lead and be isolated, the 46 neighboring cells still provide almost 98% of the capacity.
Only if a whole string of cells at the same level fail will that cause a serious degradation of the battery.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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