Nokia Lumia 521 - Battery and charger info

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Battery and charger info

Use your device only with an original BL-5J rechargeable battery.
Charge your device with AC-20U charger. Charger plug type may vary.
Third-party chargers that comply with the IEC/EN 62684 standard, and that can connect to your device micro USB connector,

may also be compatible.
Nokia may make additional battery or charger models available for this device.
Only replace the battery with a battery that is compliant with the IEEE-std-1725 standard.
Only use the battery with a charging system that has been qualified with the system per CTIA Certification Requirements for

Battery System Compliance to IEEE 1725.