Originally Posted by 
Nomad9
				 
			Hi Al,
      Be careful here, I bought one for my RRS from a reputable battery shop I think it was 700 odd amps, when I took my Sport into the dealership they connected up to the battery for supply mode whilst checking the ecu they noted the battery was under size at 700 amps, should be 900 amps to be the right one for the vehicle as supplied as original.
       I've still got the 700 odd amp battery in the vehicle because it works and seems to work fine, however when it dies and I suspect it will die a bit earlier I'm going back to the 900 amp one which I suspect is where the additional cost comes from, the RAC battery list specifies a 700 and something odd amps on their list, apparently this is wrong. 
     If you call Southerns and talk to the service guy I'm sure he will enlighten you.