[UPD] Is a power bank necessary to have inside the campus?

Hello! Incoming freshie here, and I've been making a list of the essentials I'm gonna bring with me. I've been told that a power bank is a must-have, but based on my own research, there are spots inside UPD where I can charge my devices for free. I am also planning to dorm inside the campus itself, so wala kong balak mag-cafe or mag-mall just to study and do my homework— if ever naman, baka sa library nalang ako tatambay or somewhere air-conditioned lol. With all these things in consideration, will a power bank still be useful or not?