Thanks. Swapping the NiMH pack for LFP's (like the A123 cells) would indeed be best FE wise, but I still got warranty on my good NiMH pack.
I suspected it to be lazy by infrequent use in its first year, but it did really surprise me going up and down the mountains in Germany; the meter stayed fat in the blue zone for minutes on end going uphill. The MID showed a fuel usage of less than 8 l/100km for that stretch, while my ears popped.
My aim now is for the long string of batteries to hook into the pack on contact.
I will look into that charge/discharge limiter to prevent the individual BMSes from kicking in.
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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 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.