| Weeksy the battery tray can take either the big old-type 16Ah batteries or the smaller gel type ones, and there's a removeable bit in the bottom of the tray that you don't use if you're fitting a big battery. If you want you can site the realys "inside" the tray ("mirror" them over) to acting as a spacer, and to get them a bit more out of the way of the oil filler.
Of course the battery goes in back to front (ie the writing is innermost).
But you probably knew all that.... | 
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