Inspiron 6400 Generic battery replacement

Hi everyone, and Happy New Year.

I have a simple question. Does anyone tried out those generic 9 cells battery for inspiron 6400 (E1505)? are they any good? most of them (made in China).

I ask this question because they are really cheap (90$ for 9 cells and 60$ for 6 cells) compared to genuine dell batteries (289$ and 160$).

in addition dell genuine batteries for inspiron 6400 are really bad (doesn't last beyond one year), so it is a waste of money to buy these expensive batteries.