Compared to the original battery that came in your iPod mini, our 600 mAh 3.7-volt Lithium-Ion battery provides 7 to 10 hours of playtime between charges. This is a conservative estimate, as we'd rather under-promise and then over-deliver (that being said, we regularly receive feedback from our customers reporting even longer playtimes). This robust battery is 100 percent compatible with your iPod mini and is guaranteed to last for one full year. Also included is the iOpener, a fantastic tool that opens your iPod mini without scratching it. This durable plastic tool has a sharp, wedge-shaped tip that's perfect for slipping into the tight seam between the white end caps and the metal casing, and has a long handle that allows you to firmly grasp the tool. Other companies suggest using a metal screwdriver (please don't do this!) or saddle you with two cheap, light-blue tools that are so flimsy, the tip bends and quickly becomes worthless. And then what do you do? Only iPodJuiceDotCom has the iOpener to efficiently open your device. Also included is a set of mini screwdrivers to remove two small screws and a metal clip from inside the player. This kit also includes a set of the most detailed instructions available today. Our printed instructions include professionally-taken, color photographs with detailed text that walk you step-by-step through the battery replacement process. Other companies have you go it alone or give a black-and-white photocopy with fuzzy photos that fail to point out areas where additional caution is needed.