Boat battery help.

[Angry Perch]

The batteries in my boat are toast. 210 SeaRunner with 2 batteries. Batteries run pot puller, downriggers and starting. My other boat has two deep cycle for trolling motor, and a separate starting battery. What do I want to use when the do it all?

[fishngamereaper]

24 series deep cycle is fine... generally 500-600 cca.
That's all I run. Doesn't take much to crank an outboard. And I never turn my main off so it's always charging. Especially running pot puller's.
You load test your bats?
There's a main bus fuse on those boats that fries and your batts will appear completely dead.

[pianoman9701]

Message kc_kracker

[Angry Perch]

24 series deep cycle is fine... generally 500-600 cca.
That's all I run. Doesn't take much to crank an outboard. And I never turn my main off so it's always charging. Especially running pot puller's.
You load test your bats?
There's a main bus fuse on those boats that fries and your batts will appear completely dead.

Wouldn't start last weekend. On the charger all week and still barely cranks.

[fishngamereaper]

24 series deep cycle is fine... generally 500-600 cca.
That's all I run. Doesn't take much to crank an outboard. And I never turn my main off so it's always charging. Especially running pot puller's.
You load test your bats?
There's a main bus fuse on those boats that fries and your batts will appear completely dead.

Wouldn't start last weekend. On the charger all week and still barely cranks.

Check em with a meter first if you got one. Might save ya some $$$
Obviously age is a factor. But connections could be an issue to...
But beyond that .. all's I've ever run in my boats is deep cycle.
If I had twins or triple screws I would consider an isolated starting batt...but that's not the case.

[huntnphool]

 I purchased my boat new in 2004. It came with two Odyssey PC925 batteries and I’ve never had to touch them to this day. Had my boat out a couple weeks ago to run the Cowlitz, fired right up having not been started since last Oct.

https://www.odysseybatteries.com/odyssey/powersport.html

[NRA4LIFE]

I run 2 group 27's on mine.  Put a volt meter on them.  Should read close to 14 if still good.  And yes, age is a real factor.  I generally swap them out at 6 years.

[Kc_Kracker]

You don't want to use a battery for all you want a marine starting battery for your engine and you want Marine deep cycles for your trolling motors and other stuff one is designed to discharge at a very fast rate and high output of amperage and the other one is designed to discharge very slow which would be a deep cycle a deep cycle is not good for starting and starting batteries are not good for trolling motors

[CP]

Get a marine starting battery for starting only and run everything else off a LiFePO4 deep cycle. 
 

 

[Angry Perch]

Hit Costco and we're on the water!
Thanks!

[scotsman]

A few years ago Costco changed their warranty from 3 years pro rated to just one year.  So now, every year a few days before the one year warranty expires I put a tester on the battery. If its down just a few tenths of a volt i go back and get a new one.

[h2ofowlr]

I have 3 of the Costco Interstate group 27's and they work great.

[wafisherman]

You could do an optima blue top + gray body.  Can start as well as deep cycle.  Designed to do both.  Odyssey if you have the $$.  But you could also do a cheaper starter and as suggested, get a 'deep cycle' LiFePO4 lithium battery for running everything else.

[KFhunter]

Do they make discharge protected lipo batteries in boat size?

I let my lipo4 battery discharge a bit too low in my bike and they said to toss it and get new as it wouldn't even kick on the battery charger, it just shows as nothing connected

So I jumped the lipo off my truck battery to jump the volts up, forced a charge, and then the special battery charger took over and charged it up,  but I might have damaged cells from letting it drain too low the manufacturers rep tells me when I called. 


Just something to consider on a boat, if they get down too low, they just stop like a switch, and are supposidly ruined, whereas a lead acid battery you can limp it along.

On my bike I can bump start it by coasting down a hill and run it off a mostly dead lead acid battery, the lipo battery wouldn't fire at all.

[thinkingman]

Do they make discharge protected lipo batteries in boat size?

I let my lipo4 battery discharge a bit too low in my bike and they said to toss it and get new as it wouldn't even kick on the battery charger, it just shows as nothing connected

So I jumped the lipo off my truck battery to jump the volts up, forced a charge, and then the special battery charger took over and charged it up,  but I might have damaged cells from letting it drain too low the manufacturers rep tells me when I called. 


Just something to consider on a boat, if they get down too low, they just stop like a switch, and are supposidly ruined, whereas a lead acid battery you can limp it along.

On my bike I can bump start it by coasting down a hill and run it off a mostly dead lead acid battery, the lipo battery wouldn't fire at all.

Lot's of good info in this thread...KC Cracker, I ran out of breath reading your reply!

Re Lipo batteries, I found out that Dewalt 20v do the same thing and found a fix on Youtube.
I did jump the dead battery from a live one and it takes a charge just as well as the other battery.

[birddogdad]

kind of in this situation myself.. have 2 series 24 batteries in my boat. found my alternator was needing replacement (first step) as at idle, it was running battery voltage vs closer to 14V charge rate... i have lots of electronics, radar, 2 charts, lights, downriggers ect.. can be a larger draw... change if not done to LED bulbs if you run these to reduce draw..

Make sure you purchase SAME GROUP batteries, 24s are not very big,  i am going bigger here, sure Lithium are wonderful but you can get 3 AGMs for the cost of one and increase your ampacity by different group (27 or even 31 if you have room).

Discussed is a switch for selecting batteries (1/2/both/ off) if you dont have, its a good upgrade ** NOTE** NEVER shift with a motor running, you will fry your electronics connected!

Cover positive terminals and dielectric grease is your friend!

oh, those COSTCO 27 group marine rv batteries are ok (90$ ish) and NAPA makes a 27 group 8301 marine dual purpose ( 150ish$)with a bit more ampacity as well.. 

if you are running a trolling rig, biggest baddest batteries would be my thought, i know lithium is the go too here but your use/hours really makes up the cost decision .. you can maintain them separate and install a charging system to plug in when home?

hope this helps!

[spin05]

Get a Odyssey extreme.  There's a guy in Seattle selling 1 year old ones taken out of commercial vehicles for $100. Hes got entire pallets. There model 2150.  I put one in my boat and its been excellent.  There normally a $550 battery new.   Looking to add another in the future.     https://www.facebook.com/marketplace/item/588967846193105/