Retrofit a duel battery?


New Member
Hi Community!

I am very new on this site, so please excuse me if this question is redundant or elementary.

I am aware that R&M states that if you want a “Duel Battery” it has to be ordered and built from the factory that way.

I own a R&M Charger E-Bike with a single battery and love it. But would love to add a second battery.
My question is this....
Is there any way to retrofit the bike so that it can have a duel battery function? Or is it actually true that it has to be built that way and there is nothing I can do to have it run on two?

I suppose my only other option is to just buy a spare battery and use it when the other one is depleted. I would love to hear any insight you people might have on this matter.