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The difference between a true (online) ups and a standby ups (battery backup) is (a). the online ups is always producing output ac voltage from the battery, the standby ups only does so when utility power drops below a threshold (b). the online ups only produces output ac voltage from the battery when the utility voltage drops below a threshold, otherwise it simply routes utility voltage to the output (c). the online ups is able to signal the computer when it is running on battery, the standby ups cannot do this. (d). there is no difference

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The difference between a true (online) ups and a standby ups (battery backup) is (a). the online up...
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