is this a symptom of dying battery?

[omodos]

sorry if this sounds like a repeat post but on starting the X5 this a.m and it did start I noticed what sounds like a 1 second clicking/crackling sound not sure where from though (a sound like you have radio interference) happens just before start-up when I crank key to ignition position, could this be a symptom of a weak battery too? any feedback great

History is as follows


X5 wouldn't start for first time, and when did start wasn’t the instant firing up, more of a slightly laboured ignition which I noticed happening as the temps have gone down from 19c to 7c in the last few days....battery is the oem about 8 years old and probably lasted this long as temps out here very very rarely get below +10C