iPhone 4/4S/5/5S/5C replacement batteries are available， please select: 

Replacing these batteries is quite easy and simple
Tools kit is available(highly recommended since iPhone uses special pentalobe screws) .  
Please add it in option and we'll send them together for you. 
if you forgot to buy，  please order it from this link:  http://list.qoo10.sg/g/403948440