Where can I buy an extra battery for the Gateway Gateway NV5302U?

Hi all, first post here. I just picked up a Gateway NV5302U from best buy, it was on sale for $429.

The 6-cell lithium-ion battery is about 2 1/2 hours, but im looking to buy another extra battery for when im away from an outlet extra long. Probably another 6-cell lithium-ion, but maybe a 9-cell depending on the price.

I tried looking at every retailer listed on the Gateway accessories page:

http://www.gateway.com/retail/accessories.php?cmpid=topnav_shop

and none of them have a battery for the Gateway NV53, so I'm posting here for help on where I can purchase one.

 

These might work, check the specifications...

Code:

http://www.excelcomputerinc.com/html/details.asp?ref=331&category=fedco

Code:

http://www.excelcomputerinc.com/html/details.asp?ref=507&category=fedco

Code:

http://www.excelcomputerinc.com/html/details.asp?ref=517&category=fedco

 

Thanks for the links, i think the last one is the one i need it matches the model # on the battery.