Amazon is selling a 'compact' $100 portable power bank for just $19, and it ‘fits perfectly' in a purse or pocket

TheStreet aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. A smartphone isn't just a phone, it's a map, a personal calendar, a payment method, and so much more. That being said, if your cell runs out of battery when you're…