I was about to pay $150 for a new iPod nano, but then I realized that I would only be getting 16 GB of space. My old iPod classic has 30 GB, but the battery would only last 10 minutes before dying. So I thought about it, did my research, and found this replacement battery for $16.For a fraction of the cost, this battery saved my iPod. This battery comes in a package with two soft plastic tools you can use to open up the iPod. Be sure to do your research before opening up your iPod! If you don't do your research, you can seriously damage your iPod, as I suspect was the problem with some of these other reviewers. The tools worked perfectly for me, and I was able to replace the battery in less than 20 minutes.A tip: When you try to pry open the case, slide the tool in the groove and slowly pull the bottom away perpendicular from the top. Trying to pull it down got me nowhere fast.The battery was low when I initially turned on the iPod, so I charged it. I've had my iPod on all day today in order to completely discharge the battery before charging again (and also test the new battery out).It's been on shuffle for 12 straight hours, and it still has a sliver of red battery left.12 straight hours on shuffle.This is fantastic, especially considering I mainly use this iPod while I'm exercising.If you have an old iPod and your only problem is with the battery, I highly recommend buying this one.