Dc 12v 4800mah powering a GC and screen??

[Gamerlolwind]

Hay everyone
I found this battery pack on eBay for 20 0r more $.
It's a 12v at 4800 mah,
I'm thinking of using it over the GC stock battery pack which is crap and takes forever to charge

http://www.ebay.com/itm/New-DC12V-4800m ... 415f4e4008

I think the battery's price is more in euros.

But will it work for the GC which is 12v at 3.25 a and the eBay screen which is 12v specficly?

And is it's price a bad sign of a bad battery?

Should I use this pack for my GameCube portable?

Also the jack that outputs the 12v I won't touch for connecting it to my GC/screen I have salvaged the connector cable hat plugs into the GC and screen parts to give power/recharge.
But it needs to be modded to connect to the cable of the battery pack output,

What should I do to get this to work?

 

[Diminuendo]

be careful, there are a lot of horror storys of ebay batterys no being the capacity they advertise

 

[Gamerlolwind]

be careful, there are a lot of horror storys of ebay batterys no being the capacity they advertise

yeah, i guessed as much.
i'll ask before buying the battery pack from the seller to make sure that the battery pack shown is 12v and 4800mah as advertised,
just to be 100% sure im not being fooled.

thanx for the warning tip, dude