Samsung EB-L1G6LLU Li-Ion battery (2100mAh) for Samsung Galaxy S3 i9300 / i9305 (Accessories)
The Accu fits properly in the phone, it has 4 ports, including with NFC antenna. Voltage even when the load of 1 A will remain at about 4 volts. Values 3.8 V; 7.98 Wh. Production date is not clear.