Ah! Pub visits - yep you got that right, they are all very welcome and it is the distance that is the problem.........so move up nearer to us is what Cris has just shouted in. Its cheaper than living in the smoke anyway and the air is a hell of a lot cleaner too which makes the beer taste better I reckon.
As for your battery it would, as the best advisors have already said, be best to buy a new one that is the recommended one for the model of car.
If you really have to rely on getting a used one the best place I reckon would be a breakers that break only fairly recent accident write offs. Or tour the local breakers and look under the lids for a one that is dated as being fairly new. Wherever you look though test it with the old 'tongs' type of tester to see if there are any weak cells. None of the handhelds will tell you that!
GudLuk...and may the force be with you!
By the way the largest size that would fit is 170 x 170 x 280mm.
