No, they aren't direct plugins, but with creativity other NiMH cells can be used. The newer Insight also uses a smaller battery, so it would take multiple battery packs to bring the cell count up to the minimum 120 (144 volt rating). I run a cell depth of 125 cells in my setup for a voltage rating of 150 volts.
So theoretically if someone got a hold of two second gen Insight packs they could be converted or hacked into a gen 1 Insight. But depending on cost and the cell layout it may or may not be worth it.
They are still NiMH cells rated at 5.75 AH, looks like they might have lowered capacity and raised the operational current. Think of it this way, it is a lower voltage battery that is still expected to output 15KW to the IMA motor. It has to be able to supply more current than what our gen 1's call for. No reason they wouldn't work, but the battery case would eitehr have to be heavily hacked or a new one designed.
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