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There's some internal battery tear-down videos but I've not seen an external one.
https://www.youtube.com/watch?v=eXVhNUqRdfE
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Are there electronics inside an external di2 battery ?
Yes. I stripped one down to make an internal battery before they were officially available. It's not just batteries in there.
hippy
Brommers
@user136820
Are there electronics inside an external di2 battery ? I know that there are electronics inside the mounting unit, but I'm wondering if the battery itself is simply 2 cells connected in series or if it's something more complex.
I'd like to build a cheap internal battery with 18650 cells but I need the electronics to get it to work.