You can view the deals page for APC UPS Battery Backup & Surge Protectors here. All items over $25 qualify for free shipping and returns. If you are not interested in these particular deals ...

Whether that's a blackout, brownout, or power surge, the best UPS battery backup will give you the time to save what you're doing and turn off your machine safely. Power surges and interruptions ...

while "battery+surge" means that it'll act as a surge protector with battery backup. In this setup, the UPS is plugged into a wall outlet, and the computer is then plugged into the battery/surge ...