The only downside is that I don't think this battery has quite the life that my old battery did when it was new. Despite claims that this battery would be better than the original Zune batteries. But, it was really cheap and the battery life is sufficient for what I need it for. My old battery was dying after about 30 minutes away from the charger. This battery lasts for at least 3 to 4 hours of audio. You might want to look elsewhere if you're looking for the best battery life. But if you're looking for a cheap way to make your Zune usable again, I'd recommend this battery.