Sony VGN-FS550 - Manual (Page 29)

Charging a battery
You will need to charge the battery if battery power drops below 10 percent or you have not used the battery for a long
time. The lithium-ion battery supplied with your computer may be recharged at any time, whether you wait until the battery
is completely or partially discharged. Charging a partially discharged battery does not affect battery life. If you charge the
battery and find that battery power is still low, the battery may be reaching the end of its life, and you may need to replace
it.
The battery supplied with your computer is not charged at the time of purchase.
To charge a battery
You can charge the battery when the computer is on or off. However, the battery will charge faster when the computer is
off. Charging the battery takes several hours.
Charge the battery at temperatures between 50°F and 80°F (10°C to 30°C). Lower temperatures require more time
to charge.
1. Insert the battery into the battery bay.
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 while the battery charges. The battery indicator stops blinking when the battery is fully
charged.
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 charged.
Battery indicator status Description
On The computer is using battery power.
Single blink The battery is running out of power.
Double blink The battery is charging.
Off The computer is using AC power.
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