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Old 06-13-2005, 01:29 PM
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Default Group 24 or 27 Battery

I have two group 24 starting batteries almost 4 years old I need to replace, were with the boat when I got it. My boat has a 1988 200hp Yamaha, bait pump and usual radio, gps and fishfinder. I always hear about getting the largest battery that will fit and a group 27 will fit but is that over kill, those suckers are heavy.

I am thinking about going with two group 24 dual purpose Exides, 625 MCA, 120 RC. The boat is kept trailered and I use the bait pump about half the time. Any need for going with deep cycle or sticking with the starting batteries?
Any ideas? Thanks.
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Old 06-13-2005, 01:58 PM
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Default Re: Group 24 or 27 Battery

"I always hear about getting the largest battery that will fit and a group 27 will fit but is that over kill"


Can't ever have too much juice. I carry two group 27s and a third charged one for back-up, just to say I did. Haven't ever had to use it, but it's there if/when I do....... or if I have to hand it off to you.
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Old 06-13-2005, 02:03 PM
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Default Re: Group 24 or 27 Battery

grt a combo deep cycle/starting group 24 from cabelas - 1195 MCA! - 120 bucks AGM no maint...
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Old 06-13-2005, 02:50 PM
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Default Re: Group 24 or 27 Battery

Yep, get the group 27 AGM from Cabela's. Like said above, never too much. Bigger IS better somtimes.
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Old 06-13-2005, 06:39 PM
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Default Re: Group 24 or 27 Battery

Glen & Birdman - I have 2 starting & 1 house batteries. All are Group 24 Starting Batts (don't ask). I want to upgrade to the AGM's. The house batt will be Group 27. Should the 2 starting batts be increased from Grp 24 to 27 ? Thanks
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Old 06-13-2005, 06:42 PM
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Default Re: Group 24 or 27 Battery

Quote:
Elusive - 6/13/2005 7:39 PM

Glen & Birdman - I have 2 starting & 1 house batteries. All are Group 24 Starting Batts (don't ask). I want to upgrade to the AGM's. The house batt will be Group 27. Should the 2 starting batts be increased from Grp 24 to 27 ? Thanks

good advice is to make then all the same size and type - and cabelas won't break your wallet doing it...they even ship them UPS for not much shipping...

go here:


http://www.cabelas.com/cabelas/en/te...equestid=37368
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Old 06-13-2005, 07:51 PM
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Default Re: Group 24 or 27 Battery

Always get the biggest that will fit in the space...great insurance. The extra weight is incidental.* I have two Optima AGM D31Ms. Perfect!
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Old 06-13-2005, 08:47 PM
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Default Re: Group 24 or 27 Battery

I just looked at the Cabelas AGM Advanced Angler and there is virtually no difference between the Group 24 and Group 27 performance, except the 27 weighs nine more pounds. I'm in my fifth year on two Group 24s that came new with my Parker/Yam250. When I replace them shortly I'll get the 24 so I can remove them more easily.
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Old 06-14-2005, 04:11 AM
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Default Re: Group 24 or 27 Battery

O.k., I profess almost total ignorance on this subject except this. It seems to me that other things being equal a larger battery would be able to store more power than a smaller battery. AAA size batteries have the same voltage and so forth as DD batteries, but there must be some difference otherwise every manufacturer would make their device run off AAA size, unless they just needed to make their device larger and heavier.

Therefore, following this chain of logic group 27 bats must somehow have more reserve or whatever than group 24 bats, even though the voltage and cca's are the same.

Anybody can shed light on this?
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Old 06-14-2005, 05:56 AM
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Default Re: Group 24 or 27 Battery

Get the Group 27 batteries, as othes have said " you can never have too much reserve". I bought my Group 27 Exide Marine batteries through the local BJ's Club (Sam's Club, etc.) for about $55 ea.... which is about half of what the dedicated Marine stores want to charge you.

Thanks, Fishing-Rod
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Old 06-14-2005, 06:12 AM
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Default Re: Group 24 or 27 Battery

rookie quesiton related to this thread...

Just got a 25 ' Parker. Been fishing for years off of smaller McKee crafts for inshore stuff, trout, flounder, drum, but this Parker is the first boat we've had with two batteries. What is the purpose of the battery switch and is there ever a time that the switch should be in the "Both" position? We've fished off of it quite a bit so far and have only used one of the batteries. I figure that I should switch between the two batteries while running to my numbers in order to charge them, but when would I need the "Both" position on the switch? Any advice out there?
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Old 06-14-2005, 07:59 AM
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Default Re: Group 24 or 27 Battery

If this is indeed is a trailered boat I would go with 2 dual-purpose group 24 batteries. Why go replacing the trays, etc just to put 27's in. Keep them charged when on the trailer and you'll be fine. Let's face it - you've had 2 group 24 starting batteries for 4 years - what more could you ask for? In my opinion you have very little load on the boat battery system. If you're worried about starting the boat while out - just take a portable hot-shot battery pack with you - you should have one of these even if you have 27s. If you're having problems starting that single 200 with 3 batteries, then you've got bigger problems to deal with.
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Old 06-14-2005, 10:09 AM
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Default Re: Group 24 or 27 Battery

Nine pounds. Gads. That's about like carrying an extra gallon of salt water in the bilge or livewell. Not to mention that 12-pack that doesn't "have to be" on board.
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Old 06-14-2005, 10:10 AM
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Default Re: Group 24 or 27 Battery

this was a good read as I just bought an 02-266 sailfish and 1 of the batterys died over the w/e . I guess ill go to bjs and pickup 2 new batts. I just hope the 27s will fit. I have go look to see if I currently have the 24s or 27 s. thanx for you ideas
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Old 06-15-2005, 01:04 PM
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Default Re: Group 24 or 27 Battery

I just purchased an 05 Scout 235 with a F250 on it. The first few times that I have run the boat the battery switch was in the both position and everything started fine. So I decided to try position 1 and the motor just grunted a little. Put it back on both and it started right up. Later tried position 2 and the exact same thing happened. Batteries are group 24 starting batteries and have 900 cca. They both look brand new but there are no dates on them. Anyone have any ideas?
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Old 06-15-2005, 01:59 PM
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Default Re: Group 24 or 27 Battery

Both of your batteries are weak. Get a hydrometer and test each cell of both batteries, followed by a volt-meter reading of each battery. 900CCA should be good enough to start that F250. You could just bring it back to the dealer, but if it was me I would show up with facts.
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Old 06-15-2005, 03:46 PM
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Default Re: Group 24 or 27 Battery

Quote:
Elusive - 6/13/2005 7:39 PMGlen & Birdman - I have 2 starting & 1 house batteries. All are Group 24 Starting Batts (don't ask). I want to upgrade to the AGM's. The house batt will be Group 27. Should the 2 starting batts be increased from Grp 24 to 27 ? Thanks
The bigger the better.* If ya can fit two group 65's, then put in 65's!!
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Old 06-15-2005, 10:02 PM
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Default Re: Group 24 or 27 Battery

Quote:
originalsin - 6/14/2005 6:12 AM
rookie quesiton related to this thread...
Just got a 25 ' Parker. Been fishing for years off of smaller McKee crafts for inshore stuff, trout, flounder, drum, but this Parker is the first boat we've had with two batteries. What is the purpose of the battery switch and is there ever a time that the switch should be in the "Both" position? We've fished off of it quite a bit so far and have only used one of the batteries. I figure that I should switch between the two batteries while running to my numbers in order to charge them, but when would I need the "Both" position on the switch? Any advice out there?

the battery switch is there to turn off all battery power, and choose the source(s) of your battery power.

the only time you shud use BOTH/ALL is when you can't start your engine with just one battery. after engne is started, switch back to one battery. yu shudn't use BOTH/ALL b/c.... 1) if something's wrong w/ yur electrical stuff, you'll wear down BOTH batteries ; and 2) one battery might overcharge if the second battery is at a substantially different state of charge (the 2 batteries are sensed by regulator as one battery, with the voltage being the "average" of the two).

my favorite system of all time is quite simple and cheap, w/ no isloators or combiners needed (PLEASE -- a moratorium on isolator v. combiner debates ).

on ODD days, use the "1" battery all day. on EVEN days, use the "2" battery all day. this way, you will ALWAYS have one hot battery.

that said, it's actually a good thing -- if you do NOT have an onboard charger at home on the trailer, or at the dock -- to switch to the other battery for 10-15 minutes or so while cruising, to top it off.

spend some $$$ for an onboard charger (10 amp/bank), and AGM batteries. i bought those absurdly expensive odyssey batteries, which are pretty amazing (i put almost every imaginable load on them for hours and they've never dipped below 12.4 volts or failed to crank my 115 yami 2s. my former DEKA dual purpose flooded batteries wud have crapped out for sure).







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