Lenovo IdeaPad Y450 - Manual (Page 42)

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Chapter 2. Using your computer
When you charge the battery, make sure that its temperature is between 0°
and 60°C (32° - 140°F).
„ Charging the battery
When you check the battery status and find that the battery is low, you
need to charge the battery or replace it with a charged battery.
If an AC outlet is convenient, first, connect the power cord to the
transformer pack; second, plug the power cord into an electrical outlet; and
then connect the AC adapter to the power jack of the computer.
The charging time is affected by the physical environment.
Note:
To increase the life of the battery, the computer does not start recharging
the battery immediately when it drops from fully-charged.
Y450 UserGuide V2.0 EN.book Page 33 Thursday, May 14, 2009 5:23 PM