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PostPosted: Wed Dec 19, 2018 1:30 pm 
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Joined: Sat May 01, 2010 5:03 pm
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Location: Charlevoix, MI
I have been using SLA batteries for my fish finders (ff). As the sonar technology evolves, it seems that each new generation requires more power for a full day on the water.

I know that there are Li batteries that can do the job but they are pretty expensive.
Has anyone tried using one of those accessory backup batteries that you use to recharge a cellphone or tablet as a primary battery for your ff? Yesterday I saw a backup kit with 2 10,000 mAh batteries (that's 10 Ah!) for less than $40 USD. That's less than the cost of a single 10Ah SLA, and a lot smaller and lighter. What gives?

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PostPosted: Fri Dec 21, 2018 12:31 pm 
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Joined: Sun Feb 04, 2007 2:40 pm
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Location: Orange Beach, AL
I was hoping someone would chime in on this. Right now I'm using a NOCQUA 4.4 battery and it works well and is very light but I do look at the candy bar type phone chargers and wonder how they would work or if they would even work at all.

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PostPosted: Mon Dec 24, 2018 10:12 am 
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Joined: Thu Sep 17, 2015 6:52 pm
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Location: Calgary Alberta
USB chargers are 5 volts and you need 12. You can get 12 v LiFe batteries, I use a couple the same size as the standard SLA’s. They are super light but unfortunately still fairly expensive.


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PostPosted: Mon Dec 24, 2018 11:07 am 
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Location: High Point, NC
You can buy high quality lithium batteries for a few dollars. Go to your local home hardware store and buy the cheapest cordless drill they offer. Most times you an find these types for under $50 and they'll come with two batteries plus a smart charger. Throw the drill in the trash and enjoy your new lithium batteries and smart charger. This is far and away the best source of power for kayak electrical accessories.


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PostPosted: Mon Dec 24, 2018 6:55 pm 
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Location: Charlevoix, MI
Tom Kirkman wrote:
You can buy high quality lithium batteries for a few dollars. Go to your local home hardware store and buy the cheapest cordless drill they offer. Most times you an find these types for under $50 and they'll come with two batteries plus a smart charger. Throw the drill in the trash and enjoy your new lithium batteries and smart charger. This is far and away the best source of power for kayak electrical accessories.
Interesting idea, Tom. But most of these inexpensive kits include relatively low power batteries (1.5 - 2 Ah). I am hoping to find something in the 8-10 Ah range, to keep me out on the water all day.

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PostPosted: Mon Dec 24, 2018 7:39 pm 
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Location: High Point, NC
You won't be disappointed in what I've outlined. We've used these for years and for more amp hours you just get a larger capacity battery. I'll make up a video and toss it on Youtube tomorrow.

I get about 6 hours out of a battery and carry two. Takes about 3 seconds to swap them out. My buddy went with an 18 volt and stepped it down to 12, and because of the additional capacity of the larger battery can get about 15 hours out of his.


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PostPosted: Mon Dec 24, 2018 9:20 pm 
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Location: High Point, NC
https://www.youtube.com/watch?v=nlcc3nh ... e=youtu.be


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PostPosted: Mon Dec 24, 2018 9:57 pm 
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Location: Calgary Alberta
These are the ones I'm using, one will last me about a day and a half running a 7" Lowrance FF and a 4" Lowrance Elite GPS.
https://www.amazon.com/K2-Energy-LiFEPO4-Battery-Systems/dp/B01NBFKYW4

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PostPosted: Tue Dec 25, 2018 5:29 pm 
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Location: Charlevoix, MI
Tom Kirkman wrote:
https://www.youtube.com/watch?v=nlcc3nhxFhc&feature=youtu.be
Thanks for the video, Tom. Looks like a slick system, especially if the whole fleet can swap batteries so easily.

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