Sony Handycam Vision CCD-TRV17 Operating Instructions Manual page 66

Changing the lithium battery in your camcorder
Changing the lithium battery
(1) Open the LCD panel and open the lid of the lithium battery compartment.
(2) Push the lithium battery down once and pull it out from the holder.
(3) Install a Sony CR2025 or Duracell DL-2025 lithium battery with the positive (+)
(4) Close the lid.
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