A UPS (uninterruptible power supply) contains a battery, and an inverter (a device to convert the battery power to AC line current, for running devices that plug into the wall).
Or a laptop with a working battery.
a battery
You can keep meat frozen in the freezer for months, though it is possible that it could thaw out if there was a power outage for a long period of time.
It depends entirely on the device. Give it a try.
A Battery.
Did not give congress the power to tax
Did not give congress the power to tax
Did not give congress the power to tax
Did not give congress the power to tax
The people give the local government power through voting.
The constitution
Did not give congress the power to tax
An uninterruptible power supply (UPS). This device contains a rechargeable battery that will take over whenever there's a power outage. It will give you more than enough time to save your work and shutdown the system, or start an alternative standby power source (such as a diesel-powered generator).