Sony DSR-390L, DSR-390PL Operating Instructions Manual page 54

Power Supply
Attaching the battery pack
1
Press the battery pack against
the rear of the camcorder,
aligning the side line of the
battery pack with the line on
the camcorder.
2
Slide the battery pack down
until its "LOCK" arrow points
at the matching line on the
camcorder.
Detaching the battery pack
L O C
K
54
Chapter 2 Fitting and Connections
Holding the button in, pull the
battery pack up.
L O C
K
Matching line on the
camcorder
BP-L40A/IL75/M50/M100
Align these lines.
"LOCK" arrow
L O C
K