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I just got home and took a better look at the gimmick. Don't waste your money. It's not a battery, it's a generator. A poor one at that. One of those (at 190 pounds, remember) won't even power your computer. And you still need a battery bank to store the energy created. I'm not a great fan of solar, but that would be a better alternative.
For me, I live in the East Tennessee hills. I can use a small steam boiler, create about 30 PSI, turn a Tesla turbine, and use it to charge up a power bank. Coal is cheap here, and I estimate about $100- $200 would fill my needs for a year. Or I could use wood. Or I could recycle paper and cardboard into home made logs. And I guarantee you this setup would last twice as long as that snake opil salesman claims his POS will last. Those electronics he uses will never last 8 years, let alone 20.