This package is specifically designed for Samsung Galaxy Mega 2, Model SM-G750A from AT&T as we stated in our listing.
There are many Samsung Galaxy Mega in the market, they all use different batteries.
If you do not have Samsung Galaxy Mega 2 SM-G750A, this package is not for you.
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 Samsung Galaxy Mega 2 SM-G750A(AT&T/Net10) , 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. 2)New 3900mAh Rechargeable Li_ion Battery:
* Brand: AceSoft .
* High quality Li-Ion battery.
* Battery Type: Lithium Ion.
* Battery Capacity: 3900mAh .
* Voltage: 3.8V.
* Best Replacement for the original battery with comparable standby and talk time .
3)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.