B a t t e r y i n f o r m a t i o n405. Battery information■ Charging and dischargingYour device is powered by a rechargeable battery. The fullperformance of a new battery is achieved only after two or threecomplete charge and discharge cycles. 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.If a replacement battery is being used for the first time or ifthe battery has not been used for a prolonged period, it maybe necessary to connect the charger and then disconnect andreconnect it to start the charging.Unplug the charger from the electrical plug and the devicewhen not in use. Do not leave a fully charged battery connectedto a charger, since overcharging may shorten its lifetime. If leftunused, a fully charged battery will lose its charge over time.If the battery is completely discharged, it may take a fewminutes before the charging indicator appears on the displayor before any calls can be made.