Hunter Passage 42 starter battery.

BBC16385

BBC16385

.
Sep 14, 2004
204
Hunter 42 Deltaville VA
I know I should know this but what is the size of the starter battery for this boat. I have a battery in the box but it is too heavy for me to lift out. My paperwork on this is confusing. It is either a group 24 or a group 27. But the 27 is longer than the 24. I don't know which one I have but it is either the third or fourth battery, and that is why I am confused.

This is a 1997 P42. It was at the Annapolis boat show in October 1996 for those who were there like we were. I am all Lifeline AMG but I don't know what I have now. Help please. Thanks.
 
marcham

marcham

.
Jun 17, 2022
435
Hunter 380 Comox BC
What engine do you have? what does the engine's manual recommend? For smaller Yanmar (ie: 4JH....) a group 27 or group 31 AGM starter battery would be fine. Group 24 would be on the small side for anything over 40 HP. Smaller batt = lower starter volts = more starter heat = less starter life.

You'll need to read the label or check the dimensions.

You'll need to know what fits in your tray or battery box... 2 boats are not guaranteed equal. Costco used to have good marine starting AGMs (dual posts).... Canada seems to be out, maybe they still have them in the US?
 
Terry Cox

Terry Cox

.
Dec 25, 2000
5,973
Hunter Passage 42 Shelter Bay, WA
Our 1991 P42 takes a Group 24 starter battery. It resides in a covered plastic battery box secured to the upper shelf with a strap. Does your boat have a Genset?
 
jssailem

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
23,938
CAL 35 Cruiser #21 moored EVERETT WA
BBC30
Take pictures of your batteries and post them here. Maybe we can help you decipher the problem.
 
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JamesG161

JamesG161

SBO Weather and Forecasting Forum Jim & John
Feb 14, 2014
7,962
Hunter 430 Waveland, MS
For my 50 HP Volvo engine, I use this from Walmart $100

Start Battey 50HP.png


Jim...

PS: old picture:cool:
 
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BBC16385

BBC16385

.
Sep 14, 2004
204
Hunter 42 Deltaville VA
marcham said:
What engine do you have? what does the engine's manual recommend? For smaller Yanmar (ie: 4JH....) a group 27 or group 31 AGM starter battery would be fine. Group 24 would be on the small side for anything over 40 HP. Smaller batt = lower starter volts = more starter heat = less starter life.

You'll need to read the label or check the dimensions.

You'll need to know what fits in your tray or battery box... 2 boats are not guaranteed equal. Costco used to have good marine starting AGMs (dual posts).... Canada seems to be out, maybe they still have them in the US?
Click to expand
The engine is the 60 HP turbo charge 4 cylinder Yanmar. I think it is a 4JH2-TE. I got a part number off the current battery and it comes back as a Group 24.
Terry Cox said:
Our 1991 P42 takes a Group 24 starter battery. It resides in a covered plastic battery box secured to the upper shelf with a strap. Does your boat have a Genset?
Click to expand
I think mine is a 24 also. I have the same installation you described. We have a 9kw Kohler generator.
 
Last edited:
marcham

marcham

.
Jun 17, 2022
435
Hunter 380 Comox BC
From your service manual:

1770002993757.png


Typically a group 24 is around 75 Ah and a group 27 is around 90 Ah. Group 31 would be around 105Ah. That being said.... it`s the cranking amps that really matters. A group 24 AGM can put out about 800 CCA, whereas a flooded run of the mill group 31 puts out typically around 700 CCA. So a good AGM group 24 will behave similar to a run of the mill group 31 starter / flooded battery. (The MCA rating is typically 15-20 pct higher than the CCA rating). 800 CCA is roughly equivalent to 1000 MCA.

Just to say size is one thing, but the battery cranking capacity is what matters most.

Also, no need for venting with an AGM (doesn't vent hydrogen). Marine cranking amps is rated at 0 deg C, Cold cranking ramps is rated at -18 deg C....

Get a good AGM if all you can fit is a group 24. Your starter will thank you with less heat build up.
 
marcham

marcham

.
Jun 17, 2022
435
Hunter 380 Comox BC
JamesG161 said:
For my 50 HP Volvo engine, I use this from Walmart $100

View attachment 236333

Jim...

PS: old picture:cool:
Click to expand
There's a lot of corrosion / tarnish on those wire lugs, probably time to swap them out for new ones! :) (especially the positive). Where they like that when the battery was installed in 2023? If not, the battery is likely overcharging, the release of hydrogen is corroding the tinned lugs.
 
JamesG161

JamesG161

SBO Weather and Forecasting Forum Jim & John
Feb 14, 2014
7,962
Hunter 430 Waveland, MS
marcham said:
Where they like that when the battery was installed in 2023
Click to expand
No. It was an OLD picture.
But if you look closely, it is the Size and Group, that is needed.

24MS2

Jim...
 
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