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.
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100% Brand New.
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 Samsung Rugby 4 , 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)AceSoft 1650mAh Rechargeable Li_ion Battery:
* Brand: Unbranded.
* High quality Li-Ion battery.
* Battery Type: Lithium Ion.
* Battery Capacity: 1650 mAh.
* Voltage: 3.7V.
* 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.
3)Fish Bone Winder Silicon:
* Flexible and washable if need .
* Unique cable winder for organizing your earphone cord
* Compatible with Headphone Cable,Telephone.Cable, Mouse Cable,etc
* Size: 6.4 cm x 2.8 cm Material: Silicone

• * Package includes: New 1650mAh Rechargeable Li_ion Battery X 2
• * Universal Travel Dock USB/AC Charger X 1; Fish X 1
• * Compatible with:Samsung Rugby 4 SM-B780A AT&T
• * Accessory only, cell phone not included.
• * High Quality,100% Brand New.

* Package includes: New 1650mAh Rechargeable Li_ion Battery X 2SharpCost