Nokia hs-21w User Manual

4. Battery information

Your device is powered by a rechargeable battery. The full performance of a new
battery is achieved only after two or three complete charge and discharge cycles.
The battery can be charged and discharged hundreds of times but it will
eventually wear out. When the talk and standby times are noticeably shorter than
normal, buy a new battery. Use only Nokia approved batteries, and recharge your
battery only with Nokia approved chargers designated for this device.

Unplug the charger from the electrical plug and the device when not in use. Do
not leave the battery connected to a charger. Overcharging may shorten its
lifetime. If left unused, a fully charged battery will lose its charge over time.
Temperature extremes can affect the ability of your battery to charge.

Use the battery only for its intended purpose. Never use any charger or battery
that is damaged.

Do not short-circuit the battery. Accidental short-circuiting can occur when a
metallic object such as a coin, clip, or pen causes direct connection of the positive
(+) and negative (-) terminals of the battery. (These look like metal strips on the
battery.) This might happen, for example, when you carry a spare battery in your
pocket or purse. Short-circuiting the terminals may damage the battery or the
connecting object.

Leaving the device in hot or cold places, such as in aclosed car in summer or
winter conditions, will reduce the capacity and lifetime of the battery. Always try
to keep the battery between 15°C and 25°C (59°F and 77°F). A device with a hot or