Sony VGN-U750P VAIO Read This First Manual page 13

13
Using your VAIO computer
4 Slide the LOCK lever in the direction of the arrow to secure the battery on the computer.
✍
When the computer is directly connected to AC power and has a battery pack attached, it uses power from the AC outlet.
!
For your safety, it is highly recommended that you use genuine Sony rechargeable
battery packs and AC adapters that meet the quality assurance standard, supplied by
Sony for your VAIO personal computer. Some VAIO personal computers may only
function with a genuine Sony battery.