More Lithium Choices.
Thundersky TSLCP-50ah cells (1.6kg) approx 45 cells reqd weight 72kg, take off nimh pack 22kg and means carrying around 50kg extra for a 50ah main pack.
Worth it? I know they are rugged and reliable and I have a basic BMS on the bench.
50kg call it 4% extra weight for vehicle. Projected mph hit due to weight, anyone care to guess?
Hopefully any weight penaly would be over compensated for by almost unlimited IMA use!
Kokam cells are vey nice, light and powerful but mega bucks

Weight would be much less about 1kg each for a 40ah cell, again 45 reqd so that drops weight penalty down to about 25kg