can i use a 550cca batt as second batt when main one is a 650cca?


cheers

You can but its not recomended as the lesser battery will pull down the efficiency of the better one! This is why you should change a bank of batteries if only one fails as one new and three old will drag down your new one to the level of the old ones!:) same applies to different outputs.
 
Depends... if you have 2 alternators then yes. No problem at all :)
 

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