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Libraio
I think you're about right with the battery weight. It's 5.5 kWh according to the internet, like you say. The NiMh battery in my Insight is 1 kWh and weighs around 35kg with the case. Li batteries have around 4-8 times the energy density of NiMh so you're in the right ballpark that it's going to be between 35 and 50kg.