Writing it here for posterity: Hydrogen will be the most common, powerful, universal portable battery systems used in vehicles (all), robotics, warehouses, and industry at-large within the next century (sooner for wide-scale adoption).
Unless something similar, more powerful, and safer comes along, that is what our portable electrical needs will be focused on.
For wider scale "grid" electricity, it will be modular nuclear (fission, fusion) reactors.
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