I wanted for my Samsung S3 a battery that lasts a little longer than the original battery from Samsung with 2100 mAh, that's why I bought the Polar Cell battery with 2400 mAh. Unfortunately not fulfilled this battery my expectations. The operating time is shorter than with the original battery and my phone is after prolonged use (approximately 10 to 15 minutes) is much warmer than the original battery. Have the original battery reinstalled.