You do not need a special back cover to use this batteryThis package is specifically designed for the cellphones we list here, if your cellphone is not in the list , then it's not for you.=============================================1)Universal USB/AC Charger:* This is an universal charger , which can charge virtually all smartphone li-on batteries in the market.* 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.* You only need 2 pins to charge a battery.Here is the instruction:* To Charge the battery for TCL Flip 4056W , allow the 2 metal pins on the charger to touch the 1st and the 3rd contacts of battery. * You should see the LED light turn blue on the charger, that means the contacts has been firmly connected.* The LED Light will turn Red when charging the battery, turn blue to indicate the battery is fully charged.* Input: AC 100-240V 50/60Hz 150mAh.* Output: DC 4.35V 600mAh ¡À 50mA.* USB Port Output: 5.2V 1000mAh.2)New 1950mAh Rechargeable Li_ion Battery:* Brand: AceSoft .* Battery Capacity: 1950mAh .* Voltage: 3.7V.* Our battery is sent out with little or no power, so please charge it for about 6 - 12 hours before using.3)2-Port QC 3.0 + PD 3.0 Car Charger:* Input Voltage: 12V-24V === 3.5/4A* USB-A QC Port Output: 5V/3A,9V/2A,12V/1.5A (Max 18W)* Type-C PD Port Output: 5V/3A,9V/2.22A,12V/1.5A (Max 20W)* Total Output: ¡Ü38W4)Type C USB 3.1 Male to USB 2.0 Data Sync Cable ( 3 Feet/1M ):* Support Scalable power charge.* Type: Type-C/USB 3.1 * New generic 2 in 1 Data/Charging USB Cable.5)Folding Bracket: * Material: durable& lightweight plastic. * Size: 5.2cm x 3.5cm.