■To prevent damage, do not charge the battery in temperatures less than +32 °F (0°C) or greater than +104 °F (+40 °C). Do not use the battery in temperatures less than
■Do not use the battery charger in direct sunlight or in places with excessive humidity, such as a bathroom.
■Keep the metal contacts at the top end of the battery clean.
■Never dispose of the battery in a fire.
■Do not try to disassemble or short circuit the battery.
■Recharge the battery if the phone has not been used for several months.
■Do not store batteries in places where temperatures are below
Battery chargers
Charge the batteries with the AC wall charger, universal travel charger, or cigarette lighter adapter (see Accessories, page 61). The battery does not need to be completely drained before you recharge it.
The universal travel charger allows you to charge the battery while it is attached to the phone whether the phone is turned on or off. You can also charge another battery at the same time.
After you connect the phone to one of the chargers, check the charging status:
■If the battery is charging, a message displays and the bars on the
battery indicator 
flash in sequence.
■When charging is complete, a message displays on the screen.
The typical charge time to 90% charge level for the universal travel charger, cigarette lighter adapter, and AC wall charger is
Low battery
The phone alerts you when the battery is low:
■The battery indicator flashes.
■The phone beeps three times (if you are on a call, the phone continues to beep every minute).
■The message “Low Battery! Recharge Battery Soon” displays on the screen.
If the battery level gets too low, the phone turns off and loses any function in progress. Before turning off, the phone alerts you with five beeps and the message “Low Battery, Turning Off Phone Now” displays on the screen.
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