Lomui 3900mAh Battery for Samsung Galaxy S4 I9500 I9505 B600BC High Capacity Battery type: Li-ion; Voltage: 3.8V; Capacity: 3900mAh Uses selected Top 10% Grade A cells to ensure longer battery life and charge cycles; More than 500 recharge cycles over the life of the battery. Hybrid of power & stable. Compatible with Samsung Galaxy S4 i9500 i9505 No memory effect and environmental friendly .