Cheers Don and Spruce ,
Don my battery was bought in September and is very well maintained , it does not have a CCA but does have an MCA of 960 , the model number is XV24MF ( 86Ah )
Come to think of it , it has let me down 3 times , all of them when the hazards have been used , the first time was in a different place than the second two , on this occasion the dash was telling me all manner of stuff , air bag failure , check fuel filter amongst them , the first thing i did was to pull the fuel filter out which was a mare in itself , that when i clicked that it was a power problem with all the warnings going off , i ended up putting the Numax in and starting with that , then putting the van battery back in with the van running , i had done a lot of solid work that day previously so i know the battery is good for it .
My main concern is ..... should the Numax be charged at the rate that my vans alternator charges a standard battery , will it be too much of a boost to handle ?