I have 2 diffrent batteries on my trailer (Pictures of each in below link) 1 came from the dealer (the interstate) the other I believe is an older Cell Site backup deep cycle. It's sealed but I know nothing more about it than that. I serviced the Interstate today and topped off the cells but is there an issue running these 2 in parallel on the trailer? How many AH is the Interstate and how many AH is the other (Looks like 90AH to me)?My plan is to try to hold off on buying 2 GC2 batteries till next year if I can but the 1 interstate wasn't cutting the mustard by it's self. They do ok together but thought it best to double check with you guys to make sure it was ok.http://imgur.com/a/fz8lg

drumming102 wrote:I have 2 diffrent batteries on my trailer (Pictures of each in below link) 1 came from the dealer (the interstate) the other I believe is an older Cell Site backup deep cycle. It's sealed but I know nothing more about it than that. I serviced the Interstate today and topped off the cells but is there an issue running these 2 in parallel on the trailer? How many AH is the Interstate and how many AH is the other (Looks like 90AH to me)?My plan is to try to hold off on buying 2 GC2 batteries till next year if I can but the 1 interstate wasn't cutting the mustard by it's self. They do ok together but thought it best to double check with you guys to make sure it was ok.http://imgur.com/a/fz8lgHoly cow! You really have a poor situation there. You are mixing battery types.... The green battery is probably an Interstate battery ... a flooded wet cell type, and the Marathon is an AGM battery ... very different types. It is bad enough to connect an old and a new battery together but you are mixing totally different types. One of the problems with this is the lesser and weaker of the two batteries will simply pull the other battery down to whatever level it is. I don't want to spend the time outlining why this is bad practice. Still, you might be able to make it through 2016 with these if you don't use them much... I wouldn't want to bet much money on it. Good luck.

Bad Ju-Ju to mix different batteries into one parallel bank.One will become a slave and one a master, and neither will perform up to their optimum.Go here to check on your interstate specs......https://www.interstatebatteries.com/content/product_info/marine_f.asp

You want hurt anything, but want get the full power out of them. If it works for you go for it

I've seen wet and agm run together. The owner didn't know anything other than run the genny to charge them and that's it. You dont have much choice. Buy new now or run wha cha got. If they croak, buy the 6's. Probably best to stay under 14.4 charging volts.

14.4 volts good for AGM's as a general rule; bad for interstates. Run what you got till they croak like others said.

Battery Question | Good Sam Community

11 Replies

Ed_Gee
Explorer II
Mar 01, 2016
drumming102 wrote:
I have 2 diffrent batteries on my trailer (Pictures of each in below link) 1 came from the dealer (the interstate) the other I believe is an older Cell Site backup deep cycle. It's sealed but I know nothing more about it than that. I serviced the Interstate today and topped off the cells but is there an issue running these 2 in parallel on the trailer?

How many AH is the Interstate and how many AH is the other (Looks like 90AH to me)?

My plan is to try to hold off on buying 2 GC2 batteries till next year if I can but the 1 interstate wasn't cutting the mustard by it's self. They do ok together but thought it best to double check with you guys to make sure it was ok.

http://imgur.com/a/fz8lg

Holy cow! You really have a poor situation there. You are mixing battery types.... The green battery is probably an Interstate battery ... a flooded wet cell type, and the Marathon is an AGM battery ... very different types. It is bad enough to connect an old and a new battery together but you are mixing totally different types. One of the problems with this is the lesser and weaker of the two batteries will simply pull the other battery down to whatever level it is. I don't want to spend the time outlining why this is bad practice.
Still, you might be able to make it through 2016 with these if you don't use them much... I wouldn't want to bet much money on it. Good luck.

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