You do not need a special back cover to use this battery
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100% Brand New. 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

1)To Charge battery for LG Premier , 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.
* 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)High Capacity 2700mAh Rechargeable Li_ion Battery:
* Brand: Unbranded.
* Battery Type: Lithium Ion.
* Battery Capacity: 2700 mAh.
* Voltage: 3.8V.
* 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.
* This Battery could also be charged in the phone directly thru the cell phone charger.
3)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,

• * For LG Premier Battery Charger Accessories .
• Package includes : New 2700 mAh Rechargeable Li_ion Battery X 2.
• Unversal Travel Dock USB/AC Charger X 1. USB Data Sync Charging Cable(1M / 3 Feet ) X 1
• Compatible with: LG Premier LTE L62VL( Straight Talk/Tracfone )
• Accessory only, cell phone not included.

* For LG Premier Battery Charger Accessories .SodaPop