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.
1)Universal USB/AC Charger:
* This is an universal 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
* Here is the instruction
* To Charge the battery for Microsoft Lumia 950( AT&T ) , allow the 2 metal pins on the charger to touch the 2nd and the 3rd contacts of battery.
* For other batteries, it's not necessarily to be the 2nd 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.
* The LED Light will turn Red when charging the battery, turn blue to indicate the battery is fully charged.
2)New 3100mAh Rechargeable Li_ion Battery:
* Brand: AceSoft .
* Battery Type: Lithium Ion.
* Battery Capacity: 3100mAh .
* Voltage: 3.85V.
* Best Replacement for the original battery with comparable standby and talk time .
3)Night Glowing Dual USB Car Charger:
* LED Charging Indicator.
* Input Voltage:12V or 24V DC
* Output Voltage & Current
* Port 1: 5V 2.1A
* Port 2: 5V 1.0A
4)Micro USB 3.1 Data Sync Cable ( 3 Feet/1M ):
* Type: USB 3.1.
* Transmissinon Speed: 10Gbps.
* 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.
5)Screen Touch Pen
* Soft touch tip material prevents scratching to.the screen very smooth tip
* suitable for drawing,jotting notes,playing games and navigating on your device.

• * Authorized AceSoft Dealer
• * Package includes: New 3100mAh Rechargeable Li_ion Battery X 2
• * Universal Travel Dock USB/AC Charger X 1; Screen Touch Pen X 1
• * Night Glowing Dual USB Car Charger X 1; USB 3.1 Data Cable (3ft) X 1
• * Compatible with: Microsoft Lumia 950( AT&T )

* Authorized AceSoft DealerAceSoft