Seeing as there appears to be iPhone whizzes in the house, why does my 4S keep turning its self off at seemingly random battery lives, thinking it has no battery (indicates as such when try to turn it on) but then when plugged into a power source with boot up and show, say, 72% as it did before it shut its self down? Often happens when trying to take a photo, but can also happen if its left alone with something like strava running. Is it because it's old?
Sorry for thread hijack.