Sony PCG-VX89P - Manual (Page 19)

Using Batteries
19
1 Insert the battery into the battery bay. If you want to charge more than one
battery, insert the second battery into the computer. See “Inserting a battery”
for more information.
2 Connect the AC adapter to the computer. The computer automatically
charges the battery as long as the computer is using AC power.
The battery indicator blinks in a double pattern while the battery charges. The
battery indicator stops blinking when the battery is 85 percent full. To ensure the
battery is 100 percent full, continue charging it for at least an additional hour
after the indicator stops blinking.
✍
When using two batteries, the battery you insert first charges first. The second battery
you insert begins charging when the first battery is 85 percent full.
Battery Indicator
Battery indicator