BT 75 - Manual (Page 28)

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BT Response 75 – Issue 2 – Edition 1 – 7/10/03
If the battery warning light was not lit
before the power was lost, all information
should be retained for at least one hour
(up to 6 hours for a fresh alkaline
battery).
If the light was on, data may be lost even
if a back-up battery was installed.
If no battery was installed, all information
will be lost and the BT Response 75 will
power up as new when power is restored.
If the power fails