Ontrion OX-SAM-84075 Extended Battery with Door for Samsung Admire R720 for MetroPCS - Retail Packaging - Black All batteries are FCC approved for the highest quality and dependable performance Batteries are designed to support data transfer, SMS, MMS messaging, social network media, tethering, GPS, Apps and other applications In order to obtain full capacity, OnTrion batteries should be charged for 3-4 hours Snug fit with appropriate cut outs for the camera, speaker, headphone jack, power and volume rocker Cell Capacity: 2600 mAh, Voltage: 3.7v, Compatibility: Samsung Admire R720