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Adding a deep cycle battery for graphs #14551208 11/30/22 10:27 PM
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barryfish Offline OP
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So I am adding another deep cycle battery for my 2 live 12s and 1 carbon 9. If I were to make a jumper to my starting battery as well, would this hurt my starting battery? I don't have the funds to get a lithium right now and I plan on getting lithiums within a year so I don't want to spend the money on a duralast AGM 31 series. I was just gonna get a 31 series lead deep cycle from O'Reilly's. Only reason I ask is, I have a AGM 31 interstate starting battery right now for my motor and I have been running 2 gen3 hds 7s and all the other electronics off that battery like bilge etc.... I want to be able to use both battery's to have the power last longer.

Re: Adding a deep cycle battery for graphs [Re: barryfish] #14551303 11/30/22 11:45 PM
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grout-scout Offline
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I don’t think it would be good to mix a lead acid to an AGM, they have different voltages and I believe the lead acid would try to pull from the AGM. 2 of the same kind of batteries would be fine, but obviously AGM’s are more expensive.

Just run the lead acid by itself and charge her up after every trip.

Re: Adding a deep cycle battery for graphs [Re: barryfish] #14551395 12/01/22 01:12 AM
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barryfish Offline OP
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How long would a lead acid 31 group last with 3 graphs?

Re: Adding a deep cycle battery for graphs [Re: barryfish] #14551455 12/01/22 02:02 AM
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grout-scout Offline
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I honestly can’t answer that, because don’t know the actual amp hour time of a lead acid. I know lithiums are true to their AH.


Best thing to do is pull the specs from the lowrance page. I think the 12’s pull about 3 amps each and the 9 is probably around 1.5. If you add active target, that’s another 1.5 amps or so. In standby my carbon 12 only pulls 1 amp. So, figure out what you’re going to run exactly and then you’ll know your total amp hour draw. I would think you could make a new lead acid last all day. The Walmart everstarts group 27 were 122ah, but let’s say you only get a true 80ah from them (just a guess).


I know you don’t want to spend it, but the Wieze, Chins, AmpereTime 100ah lithiums are about $320. (These are non-cranking) of course a proper charger is needed. But you’re gonna spend $100+ on a lead acid.


Edit: if you are only going to connect the AGM to the lead acid while AT the lake, it would probably be OK. I wouldn’t leave them hooked up while resting though.

Last edited by grout-scout; 12/01/22 02:05 AM.
Re: Adding a deep cycle battery for graphs [Re: barryfish] #14552735 12/02/22 04:17 AM
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barryfish Offline OP
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The one I got is the O'Reilly's 31 group lead deep cycle. It's 105AH. I don't have AT right now. I will get lithiums when I do.

Re: Adding a deep cycle battery for graphs [Re: barryfish] #14556108 12/05/22 07:48 PM
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Bweidler Offline
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I run the Impulse Lithium 12v-100ah All Purpose. running (5) 12's, mega 360 and livescope. Havent come close to killing it in a day

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