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Tesla battery engineering and construction?

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Does anyone know the actual construction of the Tesla main batteries:
List of questions.
Maybe there is a thread that addresses these issues.

How many cells ?
AH and Volts per cell?
How are they arranged - groupings?
Fault protection - can they map out bad cells?
How does the balancing happen, by groupings?
What percent of battery maximum charge is used during a charge IE what is 0 and what is 100%

I currently own a Lexus RX400h that has Nickle Hydride batteries. As best I can tell they only use about 70% of the battery capacity IE 0 to 100 indicated is only 70% of maximum capability. By the way my RX400h has 220,000 miles on it and I cannot tell any degradation in the batteries, probably because they only utilize about 70% or so.