Need help replacing laptop battery

[sdc10]

The battery on my current laptop fried out and wont hold a charge unless its plugged in so I need to replace it. Im not sure which one I need/should get so any advice would be appreciated.

My laptop is a Acer Aspire 5740g-6979

Thanks

 

[JOlsen]

http://www.laptopbatterystore.com/product/2119/acer-aspire-5740g-batteries

 

[sdc10]

http://www.laptopbatterystore.com/product/2119/acer-aspire-5740g-batteries

Thanks for the response, I ended up getting the 12 cell and had them price match a cheaper site. Not a bad deal, now just hopefully they sell quality batteries.