iPhone Battery Question

I know a couple of years back there were issues with the iPhone batteries dying out under 12-18 months of having an iPhone, is still and issue or is there a workaround for this now?

I notice that iPhones still dont have the option to have a replacable battery and this is actually a concern for me if im going to be buying an unlocked iPhone.

Regards,

Lee

I still love my iPhone. On my third! ;)

I've never had problems with my iPhone batteries and they keep their charge, unlike other phones and devices. Apple only makes quality!