Battery wear level info.

+ Use AIDA or HWiNFO32 to check wear level of your battery

+ Dell laptop battery FAQ

http://www.dell.com/content/topics/global.aspx/batteries_sitelet/en/batteries_faq?c=us&l=en&cs=19#faq15&ACD=11708984-3640576-skim525X832Xbdf779f137d5b00b319a00e402eaf5b2&AID=3640576

+ Related link
http://forum.notebookreview.com/alienware-m15x/578920-battery-s-wear-level.html