Here is the Mugen 1800mAh a very well respected brand.
http://www.mugen-power-batteries.com...t-battery.html
1800mAh and almost $20.00 cheaper too.
I put one of these in my TP2 and its fits and works great.
Bout the only down side was it took about three weeks to get shipped to me in the US which made me glad I bought two, but it is a great battery and I highly recommend it.
PS I did follow the instructions for full charge and discharge several time and since then I have gotten some great usage times.
Btw not that I'm discounting that 2000mAh ebay one for the price, but there is a thread on them here
http://forum.ppcgeeks.com/showthread...ighlight=Dopod that show very mixed results with most stating not much time improvements, but again for the price you can't beat them.
Hope it helps.