From the manufacturer

How long will this UPS power my system when the power goes out?

Runtimes of any UPS will vary based on the amount of power required by your connected devices

Will the UPS automatically switch-off from the battery backup when power is restored?

Yes, when adequate power is restored to the UPS (and is within the operating voltage range of the UPS), it will revert to passing-through utility power to connected electronics

Will this UPS provide continuous power in the case of a power outage?

This Back-UPS has a typical transfer time of 6ms to 10ms to switch to battery power when the main power goes out. The transfer time is fast enough that most devices will not experience a power drop when the UPS transitions to battery power.

Can I plug the UPS to an extension cord, or does it have to be plugged in to a wall outlet?

In order for your UPS to get the best power available, it should be plugged directly into the wall outlet. Plugging your UPS into a surge protector may cause the UPS to go to battery mode too often, when it normally would remain offline

Which battery replacement should I purchase and from where?

The internal battery of Back-UPS BE600M1 has a lifespan of 3-5 years, depending on the usage and maintenance of the battery. When the battery is ready to be replaced, you can purchase APC Replacement Battery model APCRBC154

Product Description

This APC 600VA battery backup power supply offers guaranteed power and surge protection for wireless networks, computers, and other small electronics in your home or business. This backup battery power supply is designed for use during outages and unsafe voltage fluctuations, and acts as a surge protector with battery backup in the event of damaging power surges and spikes. The APC Back-UPS BE600M1 is the ideal battery backup for computers and routers to keep you and your smart devices connected.

From the brand