Inductive charging on cylindrical axis?
I need to charge two 21700 batteries in parallel (4.2v 5a each) without a physical connector.
They are contained in a non-conductive cylinder which is 32mm in dia, but I was hoping to charge around the diameter rather than using the flat ends if at all possible.
Basic analogy: Small straw with wire coiled around it (receiving coil), slid inside of a larger straw with wire coiled around it (transmitting coil).
The batteries will be permanently sealed inside, and I do have an empty area of the cylinder which would be perfect for a charging coil to slide over.
Every system I have seen involves two flat coils with their faces brought as close to each other as possible.
I can get the faces equally close on the two cylinders.... but is it possible to use two cylinders overlapping?
Seems to me the EM field would run through vertical coils same as it does on lateral coils?... I dunno