mophie juice pack for LG G4 (3,450mAh) - Black "Stay Powerful with up to 80% extra battery! Talk time: up to 15.5 additional hours, Web browsing: up to 8.5 additional hours, Video Playback: up to 10.5 additional hours, Music Playback: up to 75 additional hours Powerful 3,450mAh rechargeable lithium-ion polymer battery Priority+ charge and sync enables pass-through charge & sync while connected to a computer. Your LG G4 recharges first, and then the juice pack case recharges itself. Standby switch lets you choose when to charge or when to save your extra battery for when you need it most. Enlarged camera cutout for volume and power buttons to enable access to controls while maintaining a high-quality premium feel.