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 Microsoft Mobile approved chargers designated for this phone. You can also use a compatible USB cable to charge your phone.
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 authorized service facility.
Authorized retail points may also offer a battery replacement service.
Important: Only qualified personnel or an authorized service facility should replace the battery. Unauthorized battery replacement may invalidate your warranty.