Eaton RT 1250VA User Manual page 24

Input: Display the voltage and frequency of the input. As the following
graphics shows: the input voltage is 210v, input frequency is 49.8Hz.
Battery: Display the voltage and capacity of the battery ( determined
by type). As the following graphics shows: the battery voltage is 28v,
the capacity of battery is 100 ％ (the capacity of battery is
approximately reckoned according to the battery voltage).
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