IPHONE 5 S

HELLO, I PURCHASE MY IPHONE 5 S IN OCTOBER 9 2012, I DONT KNOW IF THIS PARTICULAR I PHONES THEY ONLY HAVE CERTAIN AMOUNT OF TIME OR MINUTES TO USE AND THEN THEY STOP WORKING I EXPERINCED WITH AN APPLE IPHONE 4 IS STILL WORKING FOR MORE THAN 5 YEARS CAN YOU PLEASE HELP ME TO SEE WHAT IS GOING ON WITH MY IPHONE BECAUSE ALL OF A SUDDEN STOPS WORKING IT DOSENT WANT TO CHARGE ANY MORE IT HAPPENS YESTURDAY I NOTICE I DIDNT CHARGE IT IN THE NIGHT SO THE RED LITE IT WAS TO THE VERY END, I NEEDED TO LEAVE I FORGOT MY CAR CHARGER WHEN I GET HOME I CONNECT TO THE CHARGER FOR 2 HOURS I CHECK IT WAS BLACK NO SIGNS OF CHARGING SO WHAT DO I NEED TO DO, IT PROBABLY NEEDED A NEW BATERY BUT I DONT KNOW WHERE TO TAKE IT TO GET A NEW BATTERY PLEASE CAN SOMEBODY HELP ME WITH MY IPHONE....THANK YOU!!!