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Are you sure that the effort and expense in the short term will cancel out the hassle of swapping batteries on the move in the longer term?
Absolutely not sure, I'm just over-thinking out loud as to how I can be future-proofed on what will probably be my 3rd biggest purchase after house and car, actually it'll probably beat the car.
In reality the Bosch calculator says I can probably do about 50 miles with 150kg of load so for anything involving a child, the limiting factor will probably not be battery range. The extra spaces where the 2nd battery goes would probably be better used for valuables/clothes/snacks in that scenario too.
And you're right, probably just easier to get a 2nd Powerpack/range extender should the need arise.
Polygon
I'm not sure about retrofitting, my only experience with dual batteries is with bikes that come with it already installed.
I think we're on the same page but just to make sure:
You can charge both batteries whilst they're attached to the bike using the charging port on only one of the batteries, meaning that you don't have to use a separate charger for each battery. I don't think you can use a full battery like a power pack to charge a not full one (if you wanted to do that for some reason).
Retrofitting seems like quite a lot of work compared to just carrying a second battery and swapping over when required. Are you sure that the effort and expense in the short term will cancel out the hassle of swapping batteries on the move in the longer term?