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Old 04-09-2017, 05:12 PM   #1
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My 8d starting battery may dead, advice?

I purchased the boat in August, but just got a chance to check the water level in the battery. It took 2.5 gallons to fill it up. So maybe damaged?
How to have it tested?
If toasted what is recommended for replacement? The previous owner thought maybe I could down size to a 4d. He replaced the engine a couple years back with JD 4045, so he thought it could maybe use less starting power?
If replacing with a 8d what is a good economical battery? Interstate has one for 260$
Thanks
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Old 04-09-2017, 05:15 PM   #2
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Is this just the starting battery or is it a house battery, or both?
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Old 04-09-2017, 05:16 PM   #3
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If you do a quick forum search, we just had a thread about this not too long ago.
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Old 04-09-2017, 05:22 PM   #4
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2.6 boat dollars it takes more effort to think about it than doing it
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Old 04-09-2017, 05:25 PM   #5
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Quote:
Originally Posted by Mach_cat View Post
I purchased the boat in August, but just got a chance to check the water level in the battery. It took 2.5 gallons to fill it up. So maybe damaged?
How to have it tested?
If toasted what is recommended for replacement? The previous owner thought maybe I could down size to a 4d. He replaced the engine a couple years back with JD 4045, so he thought it could maybe use less starting power?
If replacing with a 8d what is a good economical battery? Interstate has one for 260$
Thanks
Probably dead....occasionally you can fill them up and a good charger will bring them back....

Or ones that I have had with bad water loss and they only lasted months at best before overheating and twice causing a nighttime scramble to disconnect and put ashore.

I would check with JD and see, but my bet is you can go way smaller than even a 4D.
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Old 04-09-2017, 05:42 PM   #6
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I have a group 34 Optima battery for my JD 4045tfm75 which is more than adequate. Now if you're going to run house loads (refrigerator, etc) you probably need something else.

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Old 04-09-2017, 06:30 PM   #7
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9 months is long enough to produce a new human being, much too long to check battery fluid level.
2.5 gallons is a lot of water. What is the battery doing after its big drink? Is it charging up and holding? Can you hit it with an equalizer charge? At least check it before you replace it, that said, it does not bode well.
At the risk of drawing in the snake oil supporters and opponents, a potion claimed to desulphate and revive a battery is cadmium sulfate,sold here as Inox Battery Conditioner. I found seriously underwatered batts not long after purchase, used it on the 2 of 3 batts which tested ok, dumped/replaced the one that didn`t, got a year out of the 8D "connected" to the other 8D, and 3 years out of the 6D serving the genset. Did the stuff help, not sure, I`d have to test(treat one and not the other) identical batts to know, search it yourself, see what you think, it gets a good rap.
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Old 04-09-2017, 07:09 PM   #8
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This is only the starting battery, house batteries are 2 8d gel batteries.
I was overseas in India until Christmas so no way to check them.
Having work done on the boat and they pulled the starting battery to get space, so I was able to get the water checked easy.

Ted I believe you and have the same engine, yours is turbo charged too?
I may have many more questions for you. My boat goes in the water in 2 weeks so I am learning her systems.

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Old 04-09-2017, 07:17 PM   #9
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Quote:
Originally Posted by Mach_cat View Post
This is only the starting battery, house batteries are 2 8d gel batteries.
I was overseas in India until Christmas so no way to check them.
Having work done on the boat and they pulled the starting battery to get space, so I was able to get the water checked easy.

Ted I believe you
and have the same engine, yours is turbo charged too?
I may have many more questions for you. My boat goes in the water in 2 weeks so I am learning her systems.

Ed
That's your first mistake.

Yes mine is turbo charged. If you have other questions you can PM me.

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Old 04-09-2017, 08:07 PM   #10
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2.6 boat dollars it takes more effort to think about it than doing it
Actually that is 0.26 boat dollars.
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Old 04-09-2017, 08:14 PM   #11
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I hate 8D batteries. They are stupid bloody back breakers. If you have to have the amps, replace it with two lighter batteries. Do I sound angry? It's a personal thing.
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Old 04-09-2017, 08:15 PM   #12
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I would replace it with something much smaller since it is just for starting. Smaller will be easier to install.
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Old 04-09-2017, 08:59 PM   #13
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I hate 8D batteries. They are stupid bloody back breakers. If you have to have the amps, replace it with two lighter batteries. Do I sound angry? It's a personal thing.

its not that personal I am equally angry about 8Ds.
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Old 04-09-2017, 09:32 PM   #14
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Is a Goup 31 enough to start that engine? If so, that would be nice.

Is the start battery easily accessible? If not, consider an AGM. If it is easy to get to, then I would just put a cheap wet LA in there. A start battery only has to one thing, and that isn't that hard. If a cheap AL battery craps out on you, that is what jumper cables are for.
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Old 04-09-2017, 11:09 PM   #15
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Somewhat easy, drop through small hatch do some yoga moves and yes you can get to it. If I was younger it would a cinch.
The house batteries are harder to get to they are gel.
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Old 04-10-2017, 12:08 AM   #16
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Somewhat easy, drop through small hatch do some yoga moves and yes you can get to it. If I was younger it would a cinch.
The house batteries are harder to get to they are gel.
Sounds like my house and thruster batteries. If you dread the prospect of checking on the water level every day, then go with AGM, or use a watering system as was recommended to me. One of the problems is that even if the battery is easy to reach, it may not be easy to see inside the cell to see the level. That is where one of those watering systems would be nice.

FWIW, I think that when I have to replace the 4 sealed LA 8D batteries in my aft lazarette, I may convert to golf cart batteries and use a watering system. The LA batteries have worked well on this boat for 7 years and I've had good luck with them in my other boats.
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Old 04-10-2017, 12:16 AM   #17
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Replace the 8D with two group 31 and that should provide MORE than enough oomph to crank that engine smartly. They should fit into the tray the 8D left.

Just fill the space left with blocking so the batteries cannot move around. Leave a space between them, but blocked, about 3/4" for air. Not likely they will build any heat when recharging but that air space will prevent excess recharge heat build up. Yeah I'm being picky but I've done that.
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Old 04-10-2017, 04:55 AM   #18
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C lectric is spot on.
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Old 04-10-2017, 05:26 AM   #19
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Would not be a bad idea to check your battery charger for overcharging.
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Old 04-10-2017, 07:53 AM   #20
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If toasted what is recommended for replacement? The previous owner thought maybe I could down size to a 4d. He replaced the engine a couple years back with JD 4045, so he thought it could maybe use less starting power?

You should be able to look up minimum cranking specs (CCAs/MCAs) for the JD 4045. Your starter may also have a tag with minimum cranking specs.

Once you know that, you can decide how much battery you need as a replacement.

Usually you'd want a bit of a cushion, but I'd guess maybe a pair of G31s would work... pending what you learn about specs.

If you're not able to inspect water levels often or easily, you might want to investigate sealed batteries, perhaps AGMs. Lots of threads about those.

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