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What are the disadvantages of uninterruptible power supplies?

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Relevant answers:

Why have an uninterruptible power supply?
Give you time to shut down if you lose your power. Not a replacement for regular back-ups though.
A What is a Uninterruptible power supplies?
A UPS is a device to ensure supply of electricity to IT systems (computer etc) in case the mains electricity is cut off, to give the user time to back up work. Uninterruptible Power Supply (UPS) is a...
Advantages of an uninterruptible power supply?
The main one is that your computer won't reboot suddenly, causing data loss or (possibly) damage.
What battery does Uninterruptible power supply use?
Usually a SLA Battery (12 or 24 Volt) with Capacity depending on "up time" after loss of power and if it is an "online" or "offline" UPS. See Wikipedia