At present; mostly (lead-acid) batteries are used, but potential powersources could be:
* compressed air canisters (see air car)
* flywheel energy storage
* organic garbages (trough anaerobic digestion)
* feces (human, animal); may be interesting in a military context as feces of small combat groups may be reused for the energy requirements of the robot assistant (see DEKA's project Slingshot stirling engine on how the system would operate)
* still untested energy sources (eg Joe Cell, ...)
* radioactive source (such as with the proposed Ford car of the '50); too proposed in movies as
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