microsoft surface studio 2 portable charger

We purchased our daughter a nearly 4K system for her engineering program at college last month. She is finding that the battery life doesn't last all day in her classes and she is not always near a power outlet to plug in/charge this laptop. She went to her university IT department today (where this computer was purchased) and was told that the battery life for this computer is 6-8 hours (or less when running coding programs). That said, we are now looking for a portable charger that will help her and the new computer survive a full day of classes. I am not tech saavy - so anything very specific would be helpful! Thanks in advance!