MARINE BATTERY

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Panfisher
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2025/02/22 18:07:17 (permalink)

MARINE BATTERY

I was at a boat launch last year and there was a couple of boaters in cayaks.  They had these lithium batteries that were real light.  I think they said they only weighed around 11 pounds but lasted all day.  I can't remember the name of the battery.  Anyone know of a lithium battery that only weighs 11 pounds? 

The only thing better than 1 day of fishing is 2 days of fishing.
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    Porktown
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    Re: MARINE BATTERY 2025/02/22 19:47:35 (permalink)
    These are lithium iron phosphate (LiFePo4) batteries. From my research, supposedly all come from 3-4 factories in China. So brand doesn’t matter too much although some swear by the more expensive brands that usually come with better warranty/customer service. If you go with a cheaper one, especially on Amazon, check reviews, pass over the listings that have 100 or less reviews. I have two. One for my trolling motor that is 12v 100ah and one for my electronics that is 12v 20ah. You’ll need to know what size you need. I have read that they are not good for starting battery. They supposedly last twice as long as lead acid batteries and as you noted about the weight. They are more expensive, but cheap ones aren’t much different than lead acid. You do need a charger that is for them though. One of mine came with a charger. I’ve been using for a year and work great so far. I can’t speak for longevity yet though. But since I take batteries off of my boat every use to charge, the lighter weight has been great. Just need open water again!

    BTW, when using on trolling motor, they hold a full voltage (which can be over 14v) charge for a lot longer than lead acid. So, it is recommended to not run your trolling motor on full for very long.
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    Panfisher
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    Re: MARINE BATTERY 2025/02/23 07:25:29 (permalink)
    Thanks for the response.  I just need a battery for trolling.  I see some of these batteries can go for up to $2000.00.  I forget what the guy told us he paid.  I think he said a few hundred dollars.  I can't lift more than 15 pounds due to heart issues, but I could lift this battery.

    The only thing better than 1 day of fishing is 2 days of fishing.
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    Panfisher
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    Re: MARINE BATTERY 2025/02/23 07:32:01 (permalink)
    Porktown
    These are lithium iron phosphate (LiFePo4) batteries. From my research, supposedly all come from 3-4 factories in China. So brand doesn’t matter too much although some swear by the more expensive brands that usually come with better warranty/customer service. If you go with a cheaper one, especially on Amazon, check reviews, pass over the listings that have 100 or less reviews. I have two. One for my trolling motor that is 12v 100ah and one for my electronics that is 12v 20ah. 



    Roughly how much does your LiFePo4 12V 100ah weigh?

    The only thing better than 1 day of fishing is 2 days of fishing.
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    Porktown
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    Re: MARINE BATTERY 2025/02/23 09:54:34 (permalink)
    The specs say 9 kilos or ~19lbs. Without actually weighing, it is about half the weight of a lead acid. My 20ah is less than 6lbs. I’d imagine the ones on kayaks are in the 20ah-50ah for electronics. Unless they put trolling motors on them.

    I have really put my 100 to the test. I have a new Minn Kota Advanced GPS Terrova that suggests to have its own power. It is basically the newer version of the iPilot if you are familiar. I have used the spot lock, drift and standard mode basically the entire day that I am not using my gas motor. I’ve had 10–12 hour days that the thing is running about 90% of the trip and didn’t run out of juice. Not sure how much I had left, but have surprised myself that it didn’t run out. I can’t really compare to a lead acid since I had a standard trolling motor when I used the lead acid. It is crazy how much more I use the new motor over my old one. Even days that I used my old one a lot, trolling along shore line cover or trolling, I’d use it about half as much as the new one. I’d imagine as low as a 50 would work for how much I used my old trolling motor. I personally wouldn’t go that low, since it stinks running out of juice on the water. You can link them too, if you wanted 2x 50. Just make sure you do it right. Linking them one way will give your 12v at 100, the other way will give you 24v at 50.
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