Nokia Bluetooth Stereo Headset BH-903 - Manual (Page 38)

B a t t e r y i n f o r m a t i o n
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lifetime. If left unused, a fully charged battery will lose its
charge over time.
Always try to keep the battery between 15°C and 25°C (59°F
and 77°F). Extreme temperatures reduce the capacity and
lifetime of the battery. A device with a hot or cold battery
may not work temporarily. Battery performance is
particularly limited in temperatures well below freezing.
Do not dispose of batteries in a fire as they may explode.
Batteries may also explode if damaged.
Never use any charger that is damaged.
Important: Operating times are estimates only
and depend on the mobile device used, features
used, battery age and condition, temperatures to
which battery is exposed, and many other factors.