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You're correct. The lithium battery is not he same as the nine volt on the ACII (it doesn't keep the unit running so it can detect power failure)
And you're correct that if the main power plug is connected to a UPS, it will never detect the power failure because from the unit's perspective, power has been uninterrupted. That's why there are two plugs - one to be connected to the power supply (that might be interrupted) and the other to be connected to a battery backup or UPS (that cannot be interrupted).
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