2x 1800mAh battery+Universal Charger+USB Cable for Nokia Lumia 521 Battery * Quantity: 2 * Brand:Deep Stretch Excellent quality battery for   Nokia Lumia 521 * This battery has an integrated that prevents overcharging and lengthens battery life. * Cell type: Lithium Ion. * Voltage: 3.7V.   Capacity :1800mAh * The battery operation time depends depends on conditions suchas:Transmitting power level, Signal (distance between the phone and the base station),Network parameters base the operator. Universal Charger * Quantity: 1 * To Charge battery for Nokia Lumia 521   ( MetroPCS ), allow the 2 metal pins on the   charger to touch the 1st and the 2nd   contacts of battery. * For other batteries, it's not necessarily to be   the 1st and 4th though, please refer to the   user manual. * You should see the LED light turn blue on   the charger, that means the contacts has   been firmly connected. * Now you could plug in the charger with   the battery into a power socket. * The LED Light will turn Red when charging   the battery, turn blue to indicate the battery is   fully charged. Micro USB Cable 3 Feet/1m * Quantity: 1 * Color: Green * New generic 2 in 1 Data/Charging USB   Cable. * Provides high-speed data transfer rates.   Software is not included. * Charging your Cell phone by connecting   this charging cable to our Wall charger or   USB car charger. * Provides data transfer, syncing functions   in between your cell phone and your PC or   laptop via USB port.     Package Content:   * 1800mAh Battery x 2 * Universal USB Charger x 1 * Micro USB Cable 3 Feet x 1 * ( Cellphone not included ) Compatible with: Nokia Lumia 521 ( MetroPCS )     *  This battery has the same dimension as your stock battery,    you do not need  a special back cover to use it