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The charging power of even the 120 Ah battery pack is decreased as the charge level reaches its maximum allowed because charging a nearly full battery cell at high power could damage the cell.  Certainly, this must also apply to charging via regen.  I don't know what full regen power is, but it might be similar to the full DC charging power of 50 kW.  The charging power as a pack nears its maximum allowed charge level is nowhere near 50 kW, so regen power when the charge level is high must be very low to protect the battery cells.


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