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Tesla battery & solar power product.
As far as I know Tesla has the most advanced battery available.
I have two I was researching and bought off Amazon (not Tesla obviously). Just goto Amazon and search solar battery charger or pack.
I put the foldable solar panel in my window and it charges my RAV battery pack when charged I put in my car for backup phone juice, has a flashlight on it too. Have a second larger solar panel and bigger battery for my laptop, tab devices, etc. Free energy.
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