Developed especially for Samsung Galaxy J3 and design to have a higher quality 3200mAh 3.85V Li-ion battery which is of higher capacity from the original 2600mAh. it's manufactured and tested under strict quality control standard and made to bring your battery life back to glory and save the money of an upgrade.It has a Build-in special microchip that will prevent your Samsung Galaxy J3 Emerge battery Over-Charging, Over-Discharging, Over-Heating and Short-Circuiting, the extended battery using high-quality grade A+ battery cells ensure 600+ cycles. Plus it has high-speed, efficient charging.The seller offers 24-Month warranty.