Take good care of your battery, it's the life force of your phone.
Your phone has an internal, non-removable, rechargeable battery. Use only Nokia approved chargers designated for this phone. You can also use a compatible USB cable to charge your phone (included).
Do not attempt to open the back cover or remove the battery from the device. To replace the battery, take the device to your nearest authorised service facility.
Only qualified personnel or an authorised service facility should replace the battery. Unauthorised battery replacement may invalidate your warranty.