how is a battery a problem in this day and age? the moon landing used small and apparently very lightweight batteries 50 yrs ago. those batteries ran everything in the capsule and had the power to run enough heating strips to warm the capsule in -250 degree temps at night and then ran compressors for a/c units fighting against +250 degree temps in the sunlight. those batteries ran the moon buggy all over the place without any charge stations. THOSE are the batteries we need now. even the mars rovers are cruising all over the surface of mars with one battery and one solar panel and has been doing it for over a decade with no problems or power degradation. nasa needs to give up their secret formula for batteriesIt's just the battery that makes it a complete nonsense development in my opinion.
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