Sony CCD-TR78 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) Slide the cover and align the mark of the cover to that of the body. Press down the cover.
(2) Push the battery in once and pull it out from the holder.
(3) Install the lithium battery with the positive (+) side facing out.
(4) Align the mark of the cover to that of the body. Press the cover until it clicks and slide the cover.
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CCD-TR78/TR88/TR98 3-810-917-13.E