HELP! Advice for 24v Battery

Great people of Crappie.com I need your help/advice for what battery(ies) to get to fit in my boat. I got the Garmin Force (it needs a 24v or 36v battery) and what I have is a 12v (thought was 24v).:banghead

This is the area I have to work with. The area size is length 14 3/4" x wide 10 1/4" x height 9 7/8"
Battery inside is a group size 27 deep cycle.
Attachment 440912
Corner of battery holder extra space
Attachment 440913

I do not know what type, size, how many etc. to put there to make it work reasonably well for my Force trolling motor. I would like a good battery but also don't want tell my wife I need a battery that is ~a mortgage payment! :Rofl

If it helps, this is a 02 Lund Explorer 1675 SS

I really appreciate your time and help!!

Check the lithium 24 volt batteries from Skinny Water Marine. Great batteries and even better people to deal with. Lithiums are going to be more $$ but well worth it, mine will probably outlive me.

Thank you! How many AH do you have? How many do you suggest?

I would go with the 100Ah. It’s dimensions are too big for your battery area (

20.5”L x9.5”W x 8.5″H).

The 60Ah dimensions are (

13.6”L x6.75”W x 8.5″H) and should work just fine. Here is the link 24V 60AH Lithium Deep Cycle Lithium Marine Battery

Hope this helps.

Your gonna need to go with a lithium battery (more expensive) or find a place for another 12 volt battery like the one you have pictured.

You've got 2 choices- either find a place to fit 2 12 volt ones like you have and link them together (in series) or plan on spending $1000+ for one lithium battery to fit your existing compartment! :yikes

A question popped up while reading your thread, is your existing wiring up to handling the 24 volt load from the TM?

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Originally Posted by slowhand

A question popped up while reading your thread, is your existing wiring up to handling the 24 volt load from the TM?

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Honestly not sure. How do I tell?


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If it's the original wiring, it's 20 years old. And sized for a 12 volt. Boat manufacturers just got by with as small a wire as they could. Garmin should have a chart that shows the recommended wire size, based on draw and length of wire.
I used a Minn Kota chart for my TM wiring up grade to 24 volts. Get marine grade wire, and circuit breaker rated for the amp draw.
I think my old wire was 10 gauge, and I replaced it with either 6 or 4 gauge wire for a 16 foot run. I can't remember exactly off the top of my head.

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I see a problem that no one has mentioned, l think. Your 12 volt battery has items hooked to it now so you will still need a 12 volt battery. Also, if using 2 batteries in series, it is not recommended to use one to feed 12 volt items while using 24 volts for a trolling motor. If a 12 volt 55 pound trolling motor is pulling say 50 amps on high, a 24 volt 55 pound trolling motor will be pulling 25 amps so smaller wire will work. I run my 80 pound Terrova on #6 because that was what l had on hand but 8 or 10 would work. I would go with 8 or 6 gauge as 10 is pushing it. Don

Update: due to how much lithium costs, I returned the Garmin Force and going to rock my '02 trolling motor with co-pilot (don't have a foot pedal) until I get it setup. Really want the spot lock but for now I'll deal without for life stuff at the moment.

I looked at mtech lithium, Dakota Lithium, and Amped Outdoors. I'll be going with Amped as the others are $970+ for the setup (I need lithium charger & series connector). I am sure they are great batteries, but with Amped I can get a single 24v 50Ah lithium battery, charger and free shipping out the door for $799. Starting to see why I have seen Amped so much on here :Rofl. Saving the extra money will also allow me to replace the 12v wiring for 24v/50ah+ and add the circuit breaker.

Space allowed: L 14 3/4" x W 10 1/4" x H 9 7/8" Current battery Group Size 27
Amped Battery: L 10 1/8 x W 6 1/2 x H 8 1/4" Group Size 24

What wire size should I use?

Thanks for yall's help. :cheers2

Its been awhile but,,, I think when lund set them boats up at the factory with 24 volt trollers, and 2 batts the batterys were turned a 1/4 in the box...They might have been group 24s though. The batts in my lund are turned and to lift them in and out you almost have to stand them on end to get under the hinged door lip in your first pic. Sorry I didn't see your first post sooner.

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Originally Posted by Central Minn

Its been awhile but,,, I think when lund set them boats up at the factory with 24 volt trollers, and 2 batts the batterys were turned a 1/4 in the box...They might have been group 24s though. The batts in my lund are turned and to lift them in and out you almost have to stand them on end to get under the hinged door lip in your first pic. Sorry I didn't see your first post sooner.

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All good! That would make sense. What batteries do you have? I have looked and I haven't been able to find any non-lithium ones that will fit.

Quote:

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Originally Posted by Central Minn

Its been awhile but,,, I think when lund set them boats up at the factory with 24 volt trollers, and 2 batts the batterys were turned a 1/4 in the box...They might have been group 24s though. The batts in my lund are turned and to lift them in and out you almost have to stand them on end to get under the hinged door lip in your first pic. Sorry I didn't see your first post sooner.

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I would agree. 2 group 24 batteries should fit that space. It'll be tight, but it should fit. I highly recommend measuring that space again, specifically the 10.25" dimension. Industry standard a group 24 is 10.25" long. Getting them both in that spot may be an exercise. Take a tape ruler to the store and measure each battery brand. Duracell lists their group 24 as 10.75". Best to actually measure.

Quote:

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Originally Posted by Lund

All good! That would make sense. What batteries do you have? I have looked and I haven't been able to find any non-lithium ones that will fit.

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29s, but its a Lund fisherman getting the batteries in and out involves brute strength and good back and some words that would get me banded from here....Lund couldn't have made that box any tighter if they tried;)

[QUOTE=Central Minn;4311215]29s, but its a Lund fisherman getting the batteries in and out involves brute strength and good back and some words that would get me banded from here....Lund couldn't have made that box any tighter if they tried QUOTE]

:Rofl I know that feeling !