Where I can buy a battery for my Dell Inspiron Mini 1012?

[bioone]

You that I have a dell laptop and the battery Dell Inspiron Mini 1012 has already told me goodbye. I do not even 5 minutes hard. I've looked at the official website of dell, but no stock and the price seems excessive to me (101 €). A friend told me to take advantage to buy a battery that is better, but ... would be unofficial, right? ? Could use a better one?
? Could you recommend any site that is legit? I'm no expert on the subject, so I come to you.

I've seen some with 8 or 12 cells, with more voltage, etc ... What does this mean? ? Are better? ? Me I can trust?
For example this: http://www.elecachat.fr/dell-inspiron-mi...eries.html
Or this:
http://www.bateriabaratos.com/dell-inspi...eries.html
http://www.pcbateria.es/dell-inspiron-mi...eries.html
will you suggest me which one of the better battery

Thanks in advance