Samsung 
smartphones and gadgets that charging with brand portable charger (power bank) is common, such as the New Trent iCarrier, Samsung battery pack, Poweradd, Anker Astro, Anker PowerCore+, Anker AK, RAVPower, Jackery Giant+, Mogix, etc.  
Power Bank also known as portable charger, external battery charger, or external battery pack. maybe you know or hear the branded product such as Anker Astro, Anker PowerCore+, Anker AK, RAVPower, Jackery Giant+, Mogix,  New Trent iCarrier, Samsung battery pack, Poweradd.
What happen if Samsung smartphone paired with DIY slim design Power Bank? does it really work? DIY (Do it Yourself) power bank can be interpreted as self-assembled power bank. On
 this time, I wanted to show that 
DIY power bank can also be used to charge smartphone 
from Samsung, the type I use for test is Samsung Galaxy Note 3. 
please 
refer to my video on Youtube, on video you can see
 the result from test using Samsung smartphone (Samsung galaxy Note 3) 
and my DIY slim design power bank. please Click on the image below:
on the video, Powerbank is work well to charge 
the Samsung smartphone and also I have tested on several other 
smartphones such as Sony Ericsson Aspen, Lenovo Vibe K4 Note, and Asus 
Zenfone 4 T001.
DIY power bank in test is slim design and has small capacity (about 2250mAh). Because it is assembled, then the battery can be selected and replaced with a large capacity such as 4000mAh or more. Please see how to create DIY Power bank slim design on my Youtube video, you can click on the image below: