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The holder has no electronics inside. The battery does. You don't need the holder. As for whether the electronics inside the battery are necessary, I don't know. I assumed Mr Shimano put them there for a reason, so kept them when I reconfigured the battery. They might just be a charging/battery management circuit, but I'm not sure.
Brommers
@user136820
So you need both the holder and the battery to make a custom one ? Simply supplying 7.4V to the battery holder doesn't work ?