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Some CPAP machines have a backup battery built in to last a certain amount of time. However this is usually only to retain the stored data. If frequent power outages are common in your area, you might want to consider purchasing an external battery unit specifically for your machine. An after market alternative is a Back-UPS unit. That can be purchased anywhere from Wal-Mart, Home Deport, or even a computer store. You simply plug your unit into the UPS unit and the unit into the wall. If the power goes out, the machine will automatically switch to battery power and continue to function for however many hours the machine is rated for. When power is restored, the batter automatically starts charging back up. This is all done automatically and requires no intervention on the user after the first initial hook up.

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