how can i make a portable mobile charger by 9v battery

You can make your own portable mobile charger by 9v battery

BT1=battery connector
K1.1=switch
C1=100uf capacitor
U1=5v voltage regulator
D2= rectifying Diode
C2=220uf capacitor
R1=150ohm resistor
D1=led
R2=330ohm resistor
R3=10kohm resistor
Female usb port

Here is a list of things you need to build the Portable USB Power Supply
1-battery connector
1-switch
1-100uf capacitor
1-5v voltage regulator
1-rectifying Diode
1-220uf capacitor
1-150ohm resistor
1-led
1-330ohm resistor
1-10kohm resistor
1-female usb port
1-pcb board
1-9v battery
1-project box

 Female usb port points:

 

                                              

solder your compoent in this arrangement and enjoy your mobile batterylife if yoy want to make it at rechargable battery than you can change it by battery

its hap and casing becomes like that