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.