Nokia BH-800 ユーザーズマニュアル

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. 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 a fully charged battery connected to a charger, since overcharging may 
shorten its lifetime. If left unused, a fully charged battery will lose its charge over 
time.

Never use any charger that is damaged.

Leaving the device in hot or cold places, such as in a closed 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 cold 
battery may not work temporarily, even when the battery is fully charged. 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. Dispose of batteries according to local regulations. Please 
recycle when possible. Do not dispose as household waste.