Hardware Power bank turning off after a minute or so when powering Logitech Z120 speakers

[Deleted User]

I want to use said speakers with my phone without the need of being next to an outlet, the speakers say they are rated for 5v 0.5a and the powerbank easily provides that and more, so i dont know what could it be https://www.trust.com/en/product/20070-powerbank-8800-portable-charger-black link to the powerbank as i could not find the model number