Nokia brand is well known for its battery life and time, the same is with Nokia Lumia 820. A fully charged battery can provide 14 hours of talk time. If the battery is providing backup support less than that, this battery means a weak or damaged battery. The battery may get harm due to water, liquid or fluid ingress, overheating, or expiry of its specified life.
In case of a weak or non sync battery get it replaced by our technician at service centre JLT. We use genuine parts and ask for fare price. You can visit us at our store, can have a live chat with us, call us at 044211494 or email us at email@example.com