EZOPower Standard Lithium-Ion Replacement Battery - 1750mAh For AT&T Nokia Lumia 820 4G Window Phone
You can't always recharge your phone when you'd like to. But with an extra repalcement battery on hand, double your talk and standby times. so you can always talk, type and work as long as you need to. Keep it in your bag or briefcase and you'll stay connected, powered up and ready to get the job done.