Hi, I want to replace the battery in my 3gs 16gb iphone (iOS 6.1.3 or 6.1.4). My battery APN is 616-0431. Do i need to replace to exactly the same APN? I read about problems that people had when replacing to different APN battery. Is it still relevant, or did apple fixed it in the software? I'm having some problem to find the APN 616-0431 battery, most batteries that are being sold are APN 6161-0435. Many Thanks.