Aukey's 20,000mAh power bank is just $21.99 from Amazon with this coupon code
Normally priced at $29.99, if you use the coupon code XWLOGID4 when you checkout, the price drops down to $21.99. That is a 27% haircut for merely typing in a combination of eight letters and numbers.
The device offers Aukey’s AIPower Technology, which helps the power bank compute the input current of the device you are charging. This allows it to generate the fastest charging speed. And with a pair of USB ports, more than one phone can be charged at a time. Heck, it even comes with a flashlight if you get stuck in the dark.
The manufacturer states that this model does not work with Qualcomm's Quick Charge 2.0. If you want an Aukey power bank compatible with QC 2.0, the company recommends its 10,000mAh unit.
According to the manufacturer, this unit will charge the Apple iPhone 6 up to seven times, and will fully charge up the Apple iPad Air. It will also work on Android phones and tablets, and other devices that feature a USB port. The power bank fully recharges in 10 hours using a 2A adapter, which is not included.
If you have a phone or tablet with poor battery life, or you are going to be away from an outlet for a while, this just might be the most valuable accessory in your possession.
source: Amazon via AndroidAuthority