This is a nice 8-outlet 650VA Uninterruptible Power Supply (UPS). All 8 outlets are surge-protected, but only 4 are protected by the battery. Upon receiving it, I plugged it in to start the initial 8-hour charge. While charging, I connected the included USB cable to my laptop. The laptop immediately recognized it.
Looking at the battery, it reports to be 5500 mAh. I let it charge for 48 hours before starting the test. To test the battery, I plugged my monitor, accessories, and laptop into the UPS and disabled all energy-saving features. This created about 45 watts of load. I expect this load to run for about an hour. I unplugged the UPS from the power to simulate a power failure and waited.
Immediately, a beep every 30 seconds indicated that the load was on battery power. At about 40 minutes, this was replaced with a rapid beep indicating the battery was near exhaustion. At 50 minutes, the UPS shut down. It didn't run as long as I thought it should, but 50 minutes isn't bad and gives the systems connected to it time to shut down properly.
Why it didn't run as long as expected is unclear. It could be that the DC-to-AC converter is inefficient. It could be that the battery is not truly 5500 mAh, but closer to 4500 mAh. It could be that the UPS's load sensor is being too aggressive, not completely draining the battery. Regardless of the reasons, it didn't live up to the 56-minute runtime it advertises for a 50-watt load. For that, I will ding this UPS one star.
Overall, this is a good UPS, comparable to other similar-sized UPSs I own from various manufacturers.