Great price from OS, for a hard to find battery. I bought this because my original battery seemed to be losing its legs. This one arrived quickly and fit the player, so that is good. Its battery life has been good, but I was hoping for off the chart, which, though unreasonable, is the reason I give in only 4 stars. I looked up the original spec and it said 12 hour battery life, which is about what I am getting out of this one. So I really can't complain. Overall, the price is what makes this a great purchase.