I tested a 9,000,000mAh battery pack from eBay that cost $10 - here's my verdict

I often get asked about cheap power banks on the internet that have extravagant claims. Well, I bought one, and here's my buying advice.

I tested a 9,000,000mAh battery pack from eBay that cost $10 - here's my verdict
I often get asked about cheap power banks on the internet that have extravagant claims. Well, I bought one, and here's my buying advice.