I would be very leery of ebay batteries for your MD player. I bought one of the Ebay gumsticks, supposedly a genuine Sony battery, but as soon as I got it, you could tell it was a fake. The print was all fuzzy and it listed two different capacities. Throwing caution to the wind, I decided to try it anyway. The second or third time I tried to recharge it in the player, it overheated and swelled up. I could barely get it out of the player, but managed. After that I bought a dedicated charger and battery from a legit online store.