I currently use two interstate 29 batteries for my trolling motors but one has died.  I have an opportunity to get two Optima R34m's for basically the price of one. I do fish a lot of tournaments and was wondering if the two AGM's are comparable to my 29's and will my Dual Pro 15 Amp/Bank Professional Series 3 Bank Charger be OK in charging them.

Did you mean Optima's?The red tops are an automotive starting battery. The blue tops are the trolling motor batteries

11 hours ago, slonezp said:

Did you mean Optima's?The red tops are an automotive starting battery. The blue tops are the trolling motor batteries

yes, sorry I meant Optima (blue tops)

Good price, but you may need to add a 3rd battery on that charger. If that’s the case you could use an extra blue top for cranking.  

I am running the blue tops and have been for several years.  They are as good as any batteries that I have ever used.  I have a 250 Verado and use one for cranking also.  The ones I  had in my last boat were over 4 years old and still going strong.

15 hours ago, NHBull said:

Good price, but you may need to add a 3rd battery on that charger. If that’s the case you could use an extra blue top for cranking.  

I have three batteries, but my cranking is still good, so I'll wait on that one. 

Optima 34m are cranking/deep cycle batteries.

 

Seems to me that for a trolling motor you'd want deep cycle only.