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Old 01-21-2018, 03:00 PM   #1
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Question 8Ds versus Diesel Truck Batteries

My boat is an 1988. Back then 8D batteries were common in boats. I have two 8Ds for start batteries for the CAT 3208T/As. The start batteries are NOT connected to a battery charger but are charged by its respective engine. I am diligent and start both engines every Sunday.

The 8ds are 5 years old and I have noticed the stbd side is getting weak. The 8ds are in the back of my ER and are a bear to lift them out to the dock and then reinstall.

I am thinking of replacing them with two, per side 850 CCA, Group 65BCI batteries. These are the same as the batteries in my diesel truck with a 6.4 engine. So two batteries per side. They would take up about the same space as an 8d, yet easier to handle.

Thoughts?
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Old 01-21-2018, 03:33 PM   #2
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Well, when I bought my boat 5 years ago, it needed batteries. It had 4 8d wet batteries. I replaced them with 4 Barracuda AGM's at a cost of a little over 2k. This fall they gave up the ghost and 4 new barracudas were now over 3500 bucks. Since my boat is all 120AC electric, as in stove, refrigerator Etc. no inverter and I always run Iron Mike when away from the dock anyway. I replaced them with 4 AGM Group 31 batteries from Tractor Supply company for 104 dollars a piece with an 18 month free replacement warranty. Both sets of batteries are wired in series. Each G31 is 995CCA, The Barracudas were 1350CCA. The Detroit's crank right up, not spending over 800 bucks a battery and the fact that I cannot get them in and out by myself. 8d's weigh 170lbs a piece where as the G31's are 65lbs a piece and I can get them in and out easily.
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Old 01-21-2018, 03:36 PM   #3
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Are your cats hard to start? Glow plugs?
If not, a single 8D should be more than you really need for both.
Do you also have a separate start batt for your genset?
I have all 3 on a single 4D. My boat came that way, with slow starting, glow plug, TMD40s and it was still A-OK. Now that I run easy starting TAMD 41s, I know I have way more batt than I need for starting. My last 4D replacement was after 12 yrs.

In case of failure, I also have a combining solenoid so my 4 6vGC House bank can be cut in for starting engines.
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Old 01-21-2018, 03:37 PM   #4
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I also have flood house batteries. Anything special to keep in mine when switching to AGMs?
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Old 01-21-2018, 03:41 PM   #5
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No I had no issues and my 24 year old year old at the time, Sentry battery charger worked fine with them.
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Old 01-21-2018, 03:42 PM   #6
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Are your cats hard to start? Glow plugs?
If not, a single 8D should be more than you really need for both.
Do you also have a separate start batt for your genset?
I have all 3 on a single 4D. My boat came that way, with slow starting, glow plug, TMD40s and it was still A-OK. Now that I run easy starting TAMD 41s, I know I have way more batt than I need for starting. My last 4D replacement was after 12 yrs.

In case of failure, I also have a combining solenoid so my 4 6vGC House bank can be cut in for starting engines.
Well the stbd battery was a little low and no glow plugs. Separate battery for genny. Genny used to have a 4D, replaced it with a truck battery and no worries.
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Old 01-21-2018, 03:52 PM   #7
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I have 2 Costco type 31s. Tossed the 8Ds.
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Old 01-21-2018, 04:35 PM   #8
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My boat had 8Ds for the house. PO changed to 6volts. So glad he did. I am too old to be moving 8 Ds. I do have 2 4Ds for start batteries, but they are very easy to access.
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Old 01-21-2018, 04:36 PM   #9
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The brand of flooded batteries makes a difference. Fishermen on the West Coast have been using Dyno batteries (Seattle) for many years. When I bought my current boat, it had 20 year old Dyno batteries for both starting and inverter. No they weren't in anything near new shape, but I could anchor for several days and still start 2 Detroits and the inverter would run lights, reefer and a box freezer overnight.
My experience fishing, the Dyno batteries lasted 8-10 years of good service. When I look at the difference in cost for other type batteries, I don't see the new style worthwhile. Current 8d price is $350 for starting and $415 for deep cycle.
I understand and agree with the difficulty of changing them, but I just hire a couple dock kids to move the ones I had. Then I'm good for 8-10 years.
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Old 01-21-2018, 04:49 PM   #10
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Quote:
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I have 2 Costco type 31s. Tossed the 8Ds.
You're just boasting! Tall buildings in a single bound as well?

Use some Odyssey's. One for each engine, have them able to be paralleled but I doubt you will ever need to.
PC2150 MS Odyssey Battery

8D's make no sense at all these days.
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Old 01-21-2018, 07:28 PM   #11
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8Ds versus Diesel Truck Batteries

I have New Interstate 8D starting and another for house loads, actually a year old now. I bought them from the marina and they installed them on the boat, more expensive but cheaper than a dr. visit. Next time Iíll switch to 4 grp 31 deep cycle for house and a 31 start battery.
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Old 01-21-2018, 08:40 PM   #12
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Originally Posted by Alaskan Sea-Duction View Post
I also have flood house batteries. Anything special to keep in mine when switching to AGMs?
Go deep cycle when you do switch.
Also check charging profiles available on your charger to match AGM charge profile specs
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Old 01-22-2018, 06:18 AM   #13
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Quote:
Originally Posted by Alaskan Sea-Duction View Post
I have two 8Ds for start batteries for the CAT 3208T/As. The start batteries are NOT connected to a battery charger but are charged by its respective engine. I am diligent and start both engines every Sunday.

I am thinking of replacing them with two, per side 850 CCA, Group 65BCI batteries. These are the same as the batteries in my diesel truck with a 6.4 engine. So two batteries per side. They would take up about the same space as an 8d, yet easier to handle.

I get the "easier to handle" part!

Your Cat manual will say how many cranking amps you need, minimum.

I dunno G65s, but the combined cranking amps from two G31s will likely start your 3208s. I'd guess 1700 CCA from those G65s will do so, as well.

We've had good luck with Odyssey PC-2150s (G31s) and it happens they offer huge cranking amps; maybe a single of those would work for you, too. Almost certainly two would... An AGM advantage: they don't self-discharge very quickly. We've left ours over a 4-month winter storage without significant self-discharge... so starting your engines every Sunday could become a thing of the past if you choose that...

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Old 01-22-2018, 06:29 AM   #14
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I'm the outlier here I guess. I use 8 Ds for start batteries and local strong backs to install. Then a charger and BMK for same. The start batteries power the dinghy davit too. The ultimate sin, I even have an 8D for the genset.
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Old 01-22-2018, 09:43 AM   #15
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I use a pair of group 24ís to start my Lehman 135. The engine jumps to life on starting. Why would you need more than a pair of 31ís to start both engines? Once one is started, you have your alternator brining up the volts to start the other engine.
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Old 01-22-2018, 08:37 PM   #16
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I use a pair of group 24’s to start my Lehman 135. The engine jumps to life on starting. Why would you need more than a pair of 31’s to start both engines? Once one is started, you have your alternator brining up the volts to start the other engine.
My Lehman's are started with the 900+ amphour house bank. I have two Group 27's to start either of the two generators. If the house bank happens to get too far depleted to start the Lehman's, I can use the generator start batteries to get going or use the generator to sufficiently recharge the house bank. In a pinch I could move the Group 31 thruster battery to the engine room and use jumper cables.
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Old 01-22-2018, 10:16 PM   #17
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ASD
I'm the outlier here I guess. I use 8 Ds for start batteries and local strong backs to install. Then a charger and BMK for same. The start batteries power the dinghy davit too. The ultimate sin, I even have an 8D for the genset.
You are not alone Tom, we have 8Ds too. But our genset batt is a "6D"( smaller than 8D, bigger than car batt), and the Onan manual stipulates it. You genset is probably bigger than our 6.5kw.
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Old 01-22-2018, 10:50 PM   #18
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Originally Posted by knotheadcharters View Post
I replaced them with 4 AGM Group 31 batteries from Tractor Supply company for 104 dollars a piece with an 18 month free replacement warranty. Both sets of batteries are wired in series. Each G31 is 995CCA, The Barracudas were 1350CCA. The Detroit's crank right up, not spending over 800 bucks a battery and the fact that I cannot get them in and out by myself. 8d's weigh 170lbs a piece where as the G31's are 65lbs a piece and I can get them in and out easily.
Huh, I never thought to look there for batteries. Their price for a group 31 start battery is almost half of what WM wants! The reviews aren't glowing but for the $$ saved, it's worth a shot.
Thanks for the info.
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Old 01-22-2018, 11:56 PM   #19
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I had two 8ds for my 3208s. After dragging those sob's out of my bilge, I replaced them with a couple group 27. If your cats are like mine, they start before the key is fully turned. The space I freed up in the battery box added two more batteries to the house bank which is now about 1200ah. No need for 8d and I can always parallel the house if I need more cranking.
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Old 01-23-2018, 08:23 AM   #20
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"Next time Iíll switch to 4 grp 31 deep cycle for house"

GP 31 are mostly created as Starts, good luck finding them in Deep cycle.

Expensive but the double tall golf carts (L16)are great if you have the height.

Sadly a batts power comes from the lead weight , so moving the L-16 is as much a PIB (pain in back) as the old 8D.
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