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Big water cooled pack with small lossey style parallel cells (if one shorts it defuses and the 46 other cells in the same tier divide the load) versus small air cooled pack with big series cells.
A cell fails when a dendrite forms and shorts it. The bigger the cell, the bigger the chance that happens to that cell. That is a problem in a series pack - a dead cell then means a dead pack.
Old Tesla packs may contain hundreds of dead cells (small cells will eventually die too), but if every tier has no more than 5 of them it is still close to 90% of its original capacity.
I always thought Tesla batteries were inherently flawed and overly complex, but because of their ability to deal with cell failure they are actually better than the competition.
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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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