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Good science fiction is supposed to be believable.

Time travel? I'll buy that. A 3-year battery? Hahahahaha.

You mean like the kind that already exist?

I was trying to make a joke ;) Next time, I will include a picture of a cat with a caption :)

My joke finder only kicked in when you mentioned the battery. We live in a scifi world, except for those darn batteries.

I'd be satisfied with an 8-hour battery and a solar panel that can charge it with 4 hours of full sunlight.