my car sometimes starts, it always starts with a jump.. is it the battery on 2002 Volvo S80

the problem happens once a day now,, but the car will start three or four times in a roll and then just wont start.

Asked by for the 2002 Volvo S80
It could be the battery sustaining some sort of an electrical draw when the car is switched off. It could be an alternator that is not sufficiently starting the car it is also possible the wiring or wiring is poor but it is likely the starter solenoid has poor conections.