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Good evening Gracia,

Is the following information, the one you are looking for?

Fitting the backup battery

1. On the underside of the Series 3a, there are two doors which swing open; the backup battery fits under the door marked ‘B’ (on the left). Open this door.
   
   
2. The backup battery slides in from left to right. Insert it with the flat side, usually marked with a + symbol, facing upwards.
   
   
   
   
   
3. Close the door again, and turn the Series 3a over.

Kind regards,
Jacques