Compatible

Sony 6 cell/9-Cell VGN-FW31J battery is brand new and light-weighted with high performance,replacement for original sony VGN-FW31J laptop battery,Guaranteed 1 year warranty,30 days money back, fast shipping,100% replacement manufacturer compatible.

 More info.,please click  online  retail shop(kinds of large capacity laptop batteries):
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http://www.salebattery.de/sony-vaio-vgn-fw31j.htm
http://www.enbattery.co.uk/sony-vaio-vgn-fw31j.htm
http://www.laptopbattery-mall.co.uk/sony-vaio-vgn-fw31j.htm
http://www.laptopbattery-mall.com/sony-vaio-vgn-fw31j.html