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.

These batteries does not come with NFC (Near Field Communication) feature. ======================================================================
100% Brand New.
1)New 4450mAh Rechargeable Li_ion Battery:
* Brand: Unbranded/Generic .
* High quality Li-Ion battery.
* Battery Type: Lithium Ion.
* Battery Capacity: 4450mAh .
* Voltage: 3.85V.
* The best spare battery for your phone.
* Best Replacement for the original battery with comparable standby and talk time .
* Our battery is sent out with little or no power, so please charge it for about 6 - 12 hours before using.
* Keep an extra battery on hand for extend standby and talk times.
* Integrated microchip prevents overcharging and lengthens battery life.
2)Micro USB Flat Cable ( 3 Feet/1M ):
* 100% Generic New and Good Quality.
* Standard Micro USB Connector which could compatible with most devices that have Micro USB Port.
* 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.
* Charge your device through a computer''s USB port or a USB power adapter.

• * Battery type: Li-ion; Voltage: 3.85V; Capacity: 4450mAh
• * Package includes: New 4450mAh Rechargeable Li_ion Battery X 1.
• * Micro USB Flat Cable 3ft X 1.
• * Compatible with: Samsung Galaxy S5 Active SM-G870A AT&T
• * Accessory only, Cell phone not included.

* Battery type: Li-ion; Voltage: 3.85V; Capacity: 4450mAhSharpCost