Yureka YU5510A Direct Connection

hi, i have a yureka YU5510A which has a battery problem every time i change the battery it works for 3-6 months then same problem. So now i want to use without battery. i want to connect it direct to an external power bank via battery pins in phone to usb connection in power bank and use the phone as a hotspot. i tried direct connection but phone keeps restarting like the battery problem that i had. any idea where to connect the ground and positive in the phone so to avoid restart issues would be appreciated...