hi my dell xps battery is very weak

just ngam ngam 1 year only...now on full charge can get like20min battery life....is it normal??? can u fix it or i need to do a refill laready??

anyway the battery cell is made in japan, capacity 53WH and litium ion..type NF343 rating 11.1v. Mine is the long rectangle shape its like long sausage, its the 6 cell one not the 9 cell one...anyway look at the link its same

http://cgi.ebay.com/NEW-Dell-BATTERY-XPS-M...1QQcmdZViewItem