5,000-10,000 mAh Power Bank for the Amazon ECHO DOT or others

Simple Power Bank Housing designed to be used with the Amazon Echo Dot. I wanted to make a bigger power bank in order to use the Echo Dot wherever I go with Wi-Fi tethering. The main circuit was to be used from another smaller power bank which can be bought for $3 https://goo.gl/5GnEe1 and the Battery that I want to use is $15 https://goo.gl/yxHI1j. Total Cost is $18. There are 3 screw holes on the bottom for you to secure the case. You should also be able to turn this into a 10,000 mAh setup by