Battery replacement suggestions C302 2018

A

Aquanut

Member
Joined
Jan 31, 2019
Messages
7
Fluid Motion Model
C-24 C
Hi,
I have a 2018 C302. The house batteries are bad. I plan on replacing all the batteries. Any recommendations as to purchasing options. What to buy, where to buy, etc.

Thanks,
 
I replaced my batteries in my C-28 with Victron Supercycle batteries and I'm happy with them. They are engineered to withstand so many full discharge cycles or deeper discharges without damaging as most typical batteries. Stock the C-28 has two 110 AH batteries, and I was able to replace it with 2 125 AH SuperCycle batteries as they are also more efficient space wise. If absolutely needed you can discharge them a bit more without harm so you get a lot more effective capacity. They are not even that much money.
 
For engine and thruster batteries I suggest you move away from the deep cycle type and go to a starting type battery. Two highly rated Group 31 AGM batteries with 1150 CCAs are the Odyssey Extreme and X2Power. The X2Power are a house labeled brand of Batteries Plus that seems to be identical to the Odyssey. I went with X2Power due to lower cost and arguably better warranty than the Odyssey.
With either the Odyssey or X2Power you may need a terminal adapter but those are readily available.
 
Isn't 7 years more normal for battery replacement? Are you having problems?

I'd have to replace next year if mine only lasted 5 years.
 
AGM and flooded battery longevity is all about how you treat them. You can kill a battery in a year if you regularly let it discharge below 20% SOC. Most well maintained AGM batteries should last 6-7 years according to the experts. There is that old saying, “Most batteries don’t die, they are murdered.”
All that said, I replaced mine at 6 years because I didn’t want to get stuck someplace in the middle of nowhere with a dead battery. All four old batteries tested OK after being replaced.
 
I recently replaced both my house and thruster/engine batteries on my 2019 R31. The OEMs went into service in August of 2018. They were more or less toast by the time I replaced them, in August 2023.

I had a top-notch marine electrical guy do the replacement. As much as I would have loved to go lithium, I know what is involved in that transition, and didn’t want to do go that route. I decided to stick with AGM, and was willing to pay for top quality. The pro I worked advised, and I agreed, to go with Lifeline. We put in Lifeline AGM 31XTs. For the house batteries, they are 125 amp hour deep cycles (so I picked up 15 amp hours per each of my four house batteries over what came with the boat). The thruster/engine batteries are not the standard deep cycle that the factory used, but instead are high cranking output batteries. My installer had already recommended them because they use the same charging specs and profile as the house bank. So bottom line: I put in Lifeline AGM replacements for all six, with profiles that are appropriate for the house bank (deep discharge) and the engine/thruster banks (high cranking), and a common charging profile so that my single charger/inverter would work for both banks. So far, they are rock solid and I love having the extra 60 amps in the house bank.

Gini
 
Gin":sge6rjyl said:
I recently replaced both my house and thruster/engine batteries on my 2019 R31. The OEMs went into service in August of 2018. They were more or less toast by the time I replaced them, in August 2023.

I had a top-notch marine electrical guy do the replacement. As much as I would have loved to go lithium, I know what is involved in that transition, and didn’t want to do go that route. I decided to stick with AGM, and was willing to pay for top quality. The pro I worked advised, and I agreed, to go with Lifeline. We put in Lifeline AGM 31XTs. For the house batteries, they are 125 amp hour deep cycles (so I picked up 15 amp hours per each of my four house batteries over what came with the boat). The thruster/engine batteries are not the standard deep cycle that the factory used, but instead are high cranking output batteries. My installer had already recommended them because they use the same charging specs and profile as the house bank. So bottom line: I put in Lifeline AGM replacements for all six, with profiles that are appropriate for the house bank (deep discharge) and the engine/thruster banks (high cranking), and a common charging profile so that my single charger/inverter would work for both banks. So far, they are rock solid and I love having the extra 60 amps in the house bank.

Gini
Click to expand...

I went with the regular group 31 lifelines, and somewhat wish I had done the XTs. I was worried about weight distribution in the boat given the port side has all 4 house batteries, and the starboard side has the engine and thruster... That said, the Lifeline's have been fantastic and don't regret a penny spent on them.
 
In my case, the added weight on the port side was helpful. My R31 lists a bit to starboard when lightly loaded (I can even it out some when cruising for 10 days or so with gear I don't keep on board otherwise). It wasn't as much additional weight per battery as the installer thought it would be, but the added bit reduced the starboard list. All in all, the Lifelines have worked out well for me.

Gini
 
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