Is this a good deal on the battery slice?

My 9-cell battery, which is still at 87,7% capacity, has still run short on me a few times, so I am considering buying a battery slice for my T430.

I found this one: [http://www.ebay.com/itm/9cell-new-Genu-57Y4545-slice-battery-For-Lenovo-ThinkPad-T510-T510i-T520-W510-/371630311766?hash=item5686e48956:g:W0kAAOSwcL5XMaxd#shpCntId&autorefresh=true](http://www.ebay.com/itm/9cell-new-Genu-57Y4545-slice-battery-For-Lenovo-ThinkPad-T510-T510i-T520-W510-/371630311766?hash=item5686e48956:g:W0kAAOSwcL5XMaxd#shpCntId&autorefresh=true), and would like to know if this is a good deal. It says that it is in new condition, so I expect it to have at least 90% capacity left.

P.S.: Please don't all go buy the 2 remaining ones, I want one too....