![19V 4.74A 27.75WH Multipurpose Mini UPS Battery Backup Security Standby Power Supply Uninterruptible Smart Power Supply - AliExpress 19V 4.74A 27.75WH Multipurpose Mini UPS Battery Backup Security Standby Power Supply Uninterruptible Smart Power Supply - AliExpress](https://ae01.alicdn.com/kf/S8e170101656c4e1a9538d5b9245b5fd6E/19V-4-74A-27-75WH-Multipurpose-Mini-UPS-Battery-Backup-Security-Standby-Power-Supply-Uninterruptible-Smart.jpg)
19V 4.74A 27.75WH Multipurpose Mini UPS Battery Backup Security Standby Power Supply Uninterruptible Smart Power Supply - AliExpress
Are there power backups that can power a desktop PC with monitor (just one) for several hours? The ones I looked at only seem to offer minutes. How much power approximately does
![Amazon.com: Tripp Lite INTERNET550SER 550VA 300W UPS Desktop Battery Back Up Compact 120V DB9 RJ11 PC, 8 Outlets,Black : Electronics Amazon.com: Tripp Lite INTERNET550SER 550VA 300W UPS Desktop Battery Back Up Compact 120V DB9 RJ11 PC, 8 Outlets,Black : Electronics](https://m.media-amazon.com/images/I/71OhCYRkvxL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Tripp Lite INTERNET550SER 550VA 300W UPS Desktop Battery Back Up Compact 120V DB9 RJ11 PC, 8 Outlets,Black : Electronics
![Amazon.com: OPTI-UPS PS1500E Sinewave Line Interactive Uninterruptible Power Supply (1500VA/900W) UPS Battery Backup AVR Surge Protection 10-Outlets ( 5-Battery / 5-Surge ) – works with Active PFC PC Power Supply : Electronics Amazon.com: OPTI-UPS PS1500E Sinewave Line Interactive Uninterruptible Power Supply (1500VA/900W) UPS Battery Backup AVR Surge Protection 10-Outlets ( 5-Battery / 5-Surge ) – works with Active PFC PC Power Supply : Electronics](https://m.media-amazon.com/images/I/717vjY2f+QS._AC_UF894,1000_QL80_.jpg)