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Accidentally purchased wrong type battery

TheBrain

Regular Contributor
Accidentally purchased wrong type battery a deep cycle from Costco https://www.costco.com/interstate-27dc-marine--rv-battery.product.100476408.html I actuelly thought it was a combination start and DC because this is the only marine type battery they sell.

Previous start batteries from autozone where labeled start and there deep cycles where labeled DC.

I've read on net that a deep cycle battery should not be used as a start battery because it gives back feed to the charging sys and ruins the alternater/ stator & rectifier for my engine is this true or false?
Currently I don’t have a battery charging meter, next cruise I will connect a multimeter and observe how she charges if it charges real high like over 14VDC then there is in fact back feed correct. That will ruin the charging sys?

Engine is a 04 johnson carbed 2 stroke 175HP.thanks for advising
 
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