Is your computer running without a UPS Backup Battery? The UPS gives you a lot of support. The UPS or uninterruptible power supply is a small device that connects your computer to a plug. Its task is simple: it receives power and sends it to your computer. It comes with a battery so it can be a hassle for your computer if the power goes out. However, in addition to maintaining power outages, the UPS offers many other valuable benefits: