Jump to content

Lithium battery for kayak fish finder.


Recommended Posts

I would like to upgrade to a lithium battery for my fish finder on my kayak.  I have a Garmin Echomap 64 CV, and would like to get 16 hours between charges.  What brand and model do members recommend?  I also will need recommendations for a charger.  Thanks.

Link to comment
Share on other sites

  • Super User

Per garmin, typical power draw is 0.7 amps. Max is 1.25. Not sure what drives the difference in their numbers, but screen brightness is one for sure. If you run your screen bright then look to the top end.

 

1.25amp * 16 hours is 20 ah usable. With most lithiums, you get 90% of capacity so 22.5 Ah battery. 
 

0.7 amp * 16 hours is ~12 ah usable and 14 ah battery. 
 

the above lead you to either a 30 ah for the first or 15-20 ah for the second. It depends how critical 16 hours is and if you use it at full brightness all the time. If you want to be sure, a 30 ah battery will do it.  I run a 9” helix and mega live on a 30ah but not for 16 hours. It’s a single day for me. 
 

im running an amped outdoors battery and have been for 3 years now. It’s $200 right now. I don’t have experience with cheaper batteries but you can get more capacity for less $$ for sure. 

  • Like 1
  • Thanks 2
Link to comment
Share on other sites

  • Super User

Casts by Fly is right.  30 Ah is a good size.  That should give you more than you need.  

 

As for a charger, I'd get a Noco Genius.  Probably a Genius 5 for your needs.  That would fully recharge your battery within 6 hours.  They're durable, high quality, versatile, and relatively cheap chargers.  They have settings for lithium, lead acid, and AGM, so you can use them for other things as well.  I use mine to charge my wife's car battery once a month (if I remember), because she never drives.  And then use it to charge my lithium trolling motor battery and AGM battery for my fish finder on my kayak.  

  • Thanks 1
Link to comment
Share on other sites

  • Super User
22 hours ago, casts_by_fly said:

Per garmin, typical power draw is 0.7 amps. Max is 1.25. Not sure what drives the difference in their numbers, but screen brightness is one for sure. If you run your screen bright then look to the top end.

 

1.25amp * 16 hours is 20 ah usable. With most lithiums, you get 90% of capacity so 22.5 Ah battery. 
 

0.7 amp * 16 hours is ~12 ah usable and 14 ah battery. 
 

the above lead you to either a 30 ah for the first or 15-20 ah for the second. It depends how critical 16 hours is and if you use it at full brightness all the time. If you want to be sure, a 30 ah battery will do it.  I run a 9” helix and mega live on a 30ah but not for 16 hours. It’s a single day for me. 
 

im running an amped outdoors battery and have been for 3 years now. It’s $200 right now. I don’t have experience with cheaper batteries but you can get more capacity for less $$ for sure. 

Nice to see someone actually post the math to solve the problem rather than people saying get the 100ah because i ran mine for a whole day and have 90% left...waste of weight and money.

 

I personally run an Ionic lithium and have for 4 years now and it has been a great battery for my NK180s and I even run a 30ah for that.

  • Thanks 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.



  • Outboard Engine

    Outboard Engine

    fishing forum

    fishing forum

    fishing tackle

    fishing

    fishing

    fishing

    fishing

    bass fish

    fish for bass



×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.