Sony DCR-IP5 Operating Instructions Manual page 22

Step 1 Preparing the power supply
Notes
l
The AC power adaptor cannot supply power if the battery pack is attached to your
camcorder.
l
The DC IN jack has "source priority." This means that the battery pack cannot supply
power when the power cord is connected to the DC IN jack, even when the power
cord is not plugged into a wall outlet.
w
A car battery
You cannot use car batteries with the camcorder.