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I asked robotics expert Scott Walter about his thoughts on the charging station for Optimus. I learnt a lot and feel Walter gives the most accurate predictions, drawing on his own experience as a pioneer and world leader in robotics design and programming and knowledge about the realities of running a robotics company.
Walter predicts that Optimus will charge standing up, possibly using a stand for support. And that this is explained by the fact Optimus will probably need a maintenance stand for service mode. I asked if charging while seated was an option, but Walter thinks the seat would be an extra part and we know Tesla is big on optimization and reducing unnecessary parts.
Charging is predicted to be done via cable, probably plugged into the torso at the back. I asked if wireless charging was a possibility but this was ruled out by Walter on the grounds it would incur an extra unnecessary part.
If you want to gain technical insights into the ongoing development of Optimus that draw from Walters pioneering experience in various fields relating to robotics then I definitely recommend following his YouTube and Twitter accounts.