Sony CCD-TRV19 Operation Manual (primary manual) Operation Manual page 32

Changing the lithium battery in the camcorder
Changing the lithium battery
When replacing the lithium battery, keep the battery pack or other power source
attached. Otherwise, you will need to reset the date and time.
(1) Open the lid of the lithium battery compartment.
(2) Push the battery in once and pull it out from the holder.
(3) Install the new lithium battery with the positive (+) side facing out.
(4) Close the lid.
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CCD-TRV11/TRV19/TRV21/TRV29/TRV119/TRV211 3-810-780-23.E