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.

This package is specifically designed for Samsung Galaxy Amp 2 Model SM-J120A from Cricket as we stated in our listing.
There are many Samsung Galaxy Amp in the market, they all use different battery
If you do not have Samsung Galaxy Amp 2 SM-J120A, this package is not for you.======================================================================
100% Brand New.
1)New 2150mAh Rechargeable Li_ion Battery:
* Brand: Unbranded/Generic .
* High quality Li-Ion battery.
* Battery Type: Lithium Ion.
* Battery Capacity: 2150mAh .
* 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)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.
* Links up your computer with your phone,which allows you to backup phonebook and contacts,store pictures,
* transfer music files,ringtones and games,and synchronize important data quickly and easily. (Software is not included.)

• * Battery type: Li-ion; Capacity: 2150mAh
• * Package includes : New 2150mAh Rechargeable Li_ion Battery X 1 ;USB Cable X 1.
• * Compatible with:Samsung Galaxy Amp 2 SM-J120A( Cricket )
• * Accessory only, cell phone not included.
• * High Quality,100% Brand New.

* Battery type: Li-ion; Capacity: 2150mAhSodaPop