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For something like the AMI, how big could the battery be?
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.
Jonny69
@stevo_com
For something like the AMI, how big could the battery be? If it were easily removable so it could be charged indoors (fire risk aside) I think it would work even better for those without driveways or kerbside charging. My GSD's 0.5kwh battery weights about three kilos, so 11 times that (dummy maths, I would assume it's not going to be as much as that even) is not beyond the realms of possibility for carrying indoors. Would help with security and adds the option to have a spare.
Make an accessible hatch, ruggedised casing, extendable handle, wheels. Away you go.