This kind of PVC Power Bank Can Be Customized According your requirement Design
Capacity : 1200mAh-2600mAh
Materials : PVC
battery:18650 battery     
input:5V 1000mA                                                                 
output:5V 1000mA                                           
The Size at least : 2.5*2.5*10cm

Welcome to Design The Power Bank By Yourselves, Below are one of our Design