Car has been good as gold until I moved out of home. Because of the grief of moving in the S2 sat in the garage at my mums house for 6 weeks and in that time the battery ran flat. Now the fooker won't keep it's charge.

I've always stuck the bigger battery out of the Diesel Sierra in but am wondering whether it's really needed. Any suggestions before I go to the motorfactors at lunch and part with some cash?

CheeRS