I would like to buy a powerbank that could provide around twice the capacity of the gadget i want to charge. My current iphone battery has 1440mah capacity and so, i need a power bank with about 3000mah max. However, theres many power bank out there which are real or fake really hard to determine. I found one with 4400 mah capacity, very compact, which I got at www.koeok.com
for $20. Even better, I found an 10000mah power bank on eBay, also very compact, for just $8 with free shipping. Which one should i trust?