I think it would be a good product for emergency situations, such as power outages.
Yes if you use it a lot, there won’t be any juice left, but that’s not the point of the product.
Also I had a question out of curiosity.
If, based on all the feedback demanding a product of this type through this survey, you decided that it would be a good idea to make a product like this, how long would it take before it would be ready to ship? Several months? A year? Longer?