Samsung Galaxy S3 Battery Backup Case from Ontrion 2100mah by Lifecharge Fits Samsung Galaxy S3 Carbon-fiber, Carbon-fiber, acrylic and polycarbonate materials offer reliable protection against damage. Built-in 2100 mAh lithium-polymer battery adds up to 8 hours of talk time, 38 hours of audio, 10 hours of Wi-Fi internet LED indicators keep you informed of the current charge status