The battery is for an NC6400 laptop. Its spec sheet lists ej092aa batteries as compatible, which both listings contain.
I asked the lister of the first item:
NC6400's spec sheet (http://h18000.www1.hp.com/products/quickspecs/12446_na/12446_na.HTML)
lists EJ092AA batteries, which your listing mentions, as compatible. Your listing also lists The NW and NX models as compatible, which are similar to the NC models. Is your item compatible with NC6400?