245. Battery information■ Charging and dischargingYour device is powered by a rechargeable battery. Thebattery intended for use with this device is BL-4B . Thisdevice is intended for use when supplied with power fromthe following chargers: AC-6U . The battery can be chargedand discharged hundreds of times, but it will eventuallywear out. When the talk and standby times are noticeablyshorter than normal, replace the battery. Use only Nokiaapproved batteries, and recharge your battery only withNokia approved chargers designated for this device. Use ofan unapproved battery or charger may present a risk offire, explosion, leakage, or other hazard.If a battery is being used for the first time or if the batteryhas not been used for a prolonged period, it may benecessary to connect the charger, then disconnect andreconnect it to begin charging the battery. If the battery iscompletely discharged, it may take several minutes beforethe charging indicator appears on the display or beforeany calls can be made.