You do not need a special back cover to use this battery This package is specifically designed for the cellphones we list here, if your cellphone is not in the list , then it's not for you. ====================================================================== 100% Brand New. 1)Universal USB/AC Charger: * The top panel could be slided and the metal contact pins are also moveable. * You can slide it back and forth to fit virtually any size of Li-On batteries in the market. * Please see our Title pictures for detail * To Charge the battery for Samsung Galaxy J4 (2018) , allow the 2 metal pins on the charger to touch the 1st and the 3rd contacts of battery. * For other batteries, it's not necessarily to be the 1st and 3rd 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. 2)3200mAh Rechargeable Li_ion Battery: * Brand: Unbranded. * High quality Li-Ion battery. * Battery Type: Lithium Ion. * Battery Capacity: 3200 mAh. * Voltage: 3.85V. * The best spare battery for your phone. * Our battery is sent out with little or no power, so please charge it for about 6 - 12 hours before using. 3)USB Data Sync Charging Cable(1M / 3 Feet ): * New generic 2 in 1 Data/Charging USB Cable. * Charging your Cell phone by connecting this charging cable to our Wall charger. * Provides data transfer, syncing functions in between your cell phone and your PC or laptop via USB port.
