Do I need a more Powereful Battery?

[Scooby Pete]

Friday I was doing some bits on the car and had the radio on whilst messing with the leccy windows.

 

After about 10 mins or faffing around I tried to start the car and the Battery was flat.

 

Jump started, then took the car for a 15 min drive, got home and all seemed well.

 

Sunday drove the car for a quick trip to the shops, got back everything was fine.

 

Got in the car this morning, started fine. on the way to waork, stopped at the paper shop and the car wouldnt start again.

 

Is it because the Pioneer AVIC-F940BT Head unit takes so much juice to run it? Is it my Battery that is giving up?

 

Can I get a stronger Battery than recomended by Subaru?

 

Ta :)

[Gambit]

Yeah would say its the Battery is on its way. I have a PC a touch screen and amp running off mine, and can be sat for over an hour sometimes using it without the engine on and its been fine :)