Microsoft Lumia 640 Battery, BoxWave [Rejuva Power Pack] 2600 mAh Backup Battery for Microsoft Lumia 640 - Sky Blue Compact and stylish aluminum design fits perfectly into your pocket, purse, or bag. An essential accessory for long trips, camping/hiking, or any time you wont have a wall outlet in easy reach Battery powered portable charger with 2600 mAh capacity and 1A output to charge tablets or smartphones. Provides 1 full charge for your smartphone devices, and extends the charge for tablets Bright digital LED display shows remaining percentage of power Charges via standard Micro USB cable (included) Package includes: (1) Rejuva Power Pack External Battery Pack and (1) durable Micro USB to USB 2.0 cable