Have Iphone 3G why won't battery show it's fully charged?

It won't seem to want to fully charge despite an overnight charge,why?

2011-11-26T06:25:16Z

Thank You guys,just making sure

M2011-11-26T05:52:51Z

Favorite Answer

old battery and needs replacing, simply. The apple batteries only have a finite life and can only do a certain number of charges before a progressive drop of in performance...

Mohamed2011-11-26T14:07:05Z

i think u definetely need a new battery because those batteries run out faster than anything and charging it a lot could mess it up so get a new battery or just get a new smartphone ur choice