Would return what you have and grab something like that. What are your PC specs? if its consuming huge amounts of power you are going to want something with a bigger battery.
surge protector =/= ups, a surge protector just protects against surges while simultaneously turning off everything connected to it (unsafely I might add).
a UPS can also have a surge protector in addition to a battery back up (UPS stands for uninterruptable power supply) so that even if your homes power goes down you still have time to shut everything down safely instead of just cutting the power.