IPOD TOUCH 4TH GENERATION QUESTION 10 POINTS?

SO I RECENTLY GOT THE NEW IPOD TOUCH 4TH G AND THE PROBLEM IS I DIDNT CHARGE IT FOR 3 HOURS WHEN I FIRST GOT IT AND NOW THE BATTERY IS SO WEIRD I MEAN IT SAYS 68% THEN GO TO 72% AND WHEN I CHARGE IT IT WON'T GO UP 95% BUT THEN WHEN I UNPLUG IT AND USE IT IT SAYS 100% IS THERE ANYWAY TO FIX IT PLEASE HELP ME THIS IS MY GIFT FOR ALL THE HARDWORK I'VE DONE I DON'T WANT IT TO BREAK ON ME BTW ITS JAILBROKEN 4.2.1 PLEASE HELPPP