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I think that you calculation is not as right as a manufacturer calculate. A Manufacturer would calculate wit the max. Voltage of the system. (4.2 V per cell). For this version the would have a bigger range of Cells. The possible Cells would be Sony Murata VTC6a 21700, Samsung 40T 21700 and...

The Problem with the regen is not the space of capacity in the battery, its the charging current of the Regen. Over 80 percent of charge the charge current need to be much lower than nominal, otherwise you would damage the Battery, if you do this multiple times.

With the Design and Size of the Pack it must be a 72 V system with a 22S8P configuration split on 2 Pack 11S8P. The Cells are A123 Systems ANR26650 with 70A of max. output per Cell and nominal Voltage of 3.3Volts per Cell. So in total 88 Cells per Block and a Total Capacity of 1.4 -1.5 Kwh...

What is the Air bag for in the bottom Cover of the Alta Pack? Looks like this (Picture is from ebay!)