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Best portable power source

Best portable power source

Best portable power source


I´m doing some research on the best portable energy source.
All these technologies listed below have been suggested. From the past thread regarding betavoltaic energy I gather that this is some years away.
How would you rate these listed technologies in terms of effectiveness and viability?

    * EEStor's Electrical Energy Storage Units

    * Balanced capacitators

    * Betavoltaic energy

    * Advanced Solar Batteries

    * Micro fuel cells

    * Nuclear power through RTG-style cells

    * Thermodynamicaly stable systems

    * Better insulators

    * Lithium Ferrous Phosphate

Thanks a lot


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