Battery Back up will be found at the bottom of the unit , inside the uncovered Square channel where the battery inserts with a thin adapter.
for more details and reference please see diagram A of page.1 in the manual provided below
Rise and shine with a Sony alarm clock radio. While a large, easy-to-read, backlit LCD display with jumbo LEDs make reading the time from across the room a snap, a battery back-up is also there to ensure that you never miss an important appointment or meeting again!
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