Battery Life
Equipped with a removable 1650 mAh Li-Ion battery, the Lumia 820 offered modest battery performance, with up to 14 hours of talk time on 2G networks and 8 hours on 3G. The standby time was rated at 330 hours for both 2G and 3G, while it could play music for up to 55 hours, reflecting its endurance in multimedia tasks despite an overall battery life endurance rating of 40 hours in older rigorous tests.