Samsung Galaxy J7 Replacement Battery - 2X 3900mAh Li-ion Battery with Universal Travel Dock & USB/AC Charger - Compatible with SM-J700T (T-Mobile 2015) & SM-J700 EB-BJ700BBC - Perfect for Travel, Business & Emergency Power Backup

You do not need a special back cover to use this batteryThis 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 J7 SM-J700T( T-Mobile ) , 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)New 3900mAh Rechargeable Li_ion Battery:* Brand: AceSoft .* Battery Type: Lithium Ion.* Battery Capacity: 3900mAh .* Voltage: 3.85V.* Best Replacement for the original battery with comparable standby and talk time .