437. Battery and charger informationYour device is powered by a rechargeable battery. The batteryintended for use with this device is BL-4C 860 mAh Li-Ion battery.This device is intended for use when supplied with power fromthe following chargers: Nokia AC-6U. The battery can be chargedand discharged hundreds of times, but it will eventually wear out.When the talk and standby times are noticeably shorter thannormal, replace the battery. Use only Nokia approved batteries,and recharge your battery only with Nokia approved chargersdesignated for this device. Use of an unapproved battery or chargermay present a risk of fire, explosion, leakage, or other hazard.If a battery is being used for the first time or if the battery has notbeen used for a prolonged period, it may be necessary to connectthe charger, then disconnect and reconnect it to begin chargingthe battery. If the battery is completely discharged, it may takeseveral minutes before the charging indicator appears on thedisplay or before any calls can be made.Always switch the device off and disconnect the charger beforeremoving the battery.Unplug the charger from the electrical plug and the device whennot in use. Do not leave a fully charged battery connected to acharger, since overcharging may shorten its lifetime. If left unused,a fully charged battery will lose its charge over time.