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Cranking battery question


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#1 b_cdot

 
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Posted 20 April 2017 - 10:20 PM

I'm going on year 6 with my cranking battery. Graph has been showing 12.2-12.3 volts with graphs running and livewell. Checked cell levels and notice all 6 were a bit low so I topped them up with STERILE water not DISTILLED. Didn't realise there was much difference until afterwards. I was told by a battery company that bottled drinking water is safe. I had a hard time believing that. My question is will sterile water harm my battery cells? And another question. Will I notice an increase in voltage after topping them up and giving them a charge? Thanks for any help. I'm trying to understand batteries so I can take better care of them in the future. 



#2 Garnet

 
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Posted 21 April 2017 - 05:59 AM

My experience with battery's when they start using water they are on the way out.

#3 stonefish

 
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Posted 21 April 2017 - 07:36 AM

Distilled water is better, I don't think you did much harm to the battery by adding sterile water,
Anything after 6 years is a bonus for a lead acid battery,
The cranking battery in my boat is also 6 years old and still tests fine, but I am replacing it regardless,

#4 b_cdot

 
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Posted 21 April 2017 - 10:26 PM

Thanks for the replies fellas. What is your opinion about buying a deep cycle battery for cranking and running big graphs and also running live well and recirculators often? Is it a good idea? Im sure there is 100 threads on this question already. Any opinions, experiences?

#5 JohnBacon

 
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Posted 21 April 2017 - 11:15 PM

Thanks for the replies fellas. What is your opinion about buying a deep cycle battery for cranking and running big graphs and also running live well and recirculators often? Is it a good idea? Im sure there is 100 threads on this question already. Any opinions, experiences?

 

What size motor do you have?  If you are trying to start a big 250 hp motor, then a deep cycle may not be able to supply the amps required.  Smaller motors should be fine with a deep cycle.



#6 b_cdot

 
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Posted 22 April 2017 - 02:31 AM

Im running a a 150 merc v. I have two big lowrance hds units. Its seems better to have a deep cycle battery to run two "computers" livewells, lights than to be draining a cranking battery.

#7 porkpie

 
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Posted 22 April 2017 - 04:13 AM

Costco has a good size deep cycle/ starting battery. I'm going to pick one up this week, I just added a second graph and I don't trust the starting battery to run the whole show. might be worth a look to see if it will work with your outboard. I've only got a 50 so it'll be no problem.

#8 JohnBacon

 
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Posted 22 April 2017 - 09:31 AM

Im running a a 150 merc v. I have two big lowrance hds units. Its seems better to have a deep cycle battery to run two "computers" livewells, lights than to be draining a cranking battery.

 

You may want to consider a two battery setup; one for the main motor and one for all of your accessories.  I think there are isolaters that will allow your main motor to charge both batteries but prevent your accessories from draining your starting battery.



#9 BassMan11

 
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Posted 22 April 2017 - 10:39 AM

I just went through this delemma. Basically as stated above if you have the room for two batteries ( 1starting 1 deep cycle for your master panel) that is the ideal setup. I did not have the room so I went with a dual purpose AGM battery with 800mca and 75ah (@20amp draw) because I could only fit a group size 24 battery in the compartment.

If you do decide to go dual purpose and have the room grab a Kirkland group size 27 dual purpose with 850mca and 120ah at Costco for $130.

I also found this site which is a good guideline to what CCA and MCA you need for your motor on the Deka battery site.

http://www.dekabatte...tionslayout.pdf

Good luck.

#10 b_cdot

 
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Posted 22 April 2017 - 01:24 PM

 

You may want to consider a two battery setup; one for the main motor and one for all of your accessories.  I think there are isolaters that will allow your main motor to charge both batteries but prevent your accessories from draining your starting battery.

 

 

 

I just went through this delemma. Basically as stated above if you have the room for two batteries ( 1starting 1 deep cycle for your master panel) that is the ideal setup. I did not have the room so I went with a dual purpose AGM battery with 800mca and 75ah (@20amp draw) because I could only fit a group size 24 battery in the compartment.

If you do decide to go dual purpose and have the room grab a Kirkland group size 27 dual purpose with 850mca and 120ah at Costco for $130.

I also found this site which is a good guideline to what CCA and MCA you need for your motor on the Deka battery site.

http://www.dekabatte...tionslayout.pdf

Good luck.

 

If I did have the room for another battery I totally would consider it but I only have a compartment for one starting battery. Thanks for the advice and the link. Will be looking into this new battery likely this season. This is great forum thanks for all the input.



#11 liverelease

 
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Posted 22 April 2017 - 05:41 PM

My cranking battery was a 2011, and my trolling motor deep cycles were 2012, replaced all,  if your into 6 years, and having issues you dont want to get a toe or paddle your way back to the launch, time to replace



#12 b_cdot

 
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Posted 23 April 2017 - 06:23 AM

Ive load tested it my cranker and it drops to 10.6 volts when i start it. Ill push it for some more trips but i will likely be replacing this year. Going to give my terminals a good cleaning today since i saw a bit of oxidization when i looked the other day

#13 b_cdot

 
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Posted 23 April 2017 - 06:27 AM

Pls dont mention tows or paddling lol

#14 stonefish

 
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Posted 23 April 2017 - 12:19 PM

Equipment failure is not an option for me on the big water, or any water for that matter, specially in bad/rough weather.
I will be replacing my 6 year old battery before I hit the water this year.
I also carry good jumper cables in case I need a boost from my trolling motor battery or another boat.
I have never needed the jumper cables for my battery but have helped a couple of boaters with dead batteries.

#15 Canuck

 
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Posted 23 April 2017 - 01:03 PM

Costco has a good size deep cycle/ starting battery. I'm going to pick one up this week, I just added a second graph and I don't trust the starting battery to run the whole show. might be worth a look to see if it will work with your outboard. I've only got a 50 so it'll be no problem.

I was in Costco in Mississauga this AM.  They have both the big group 27 deep cycle/cranking as well as group 24 pure deep cycle.  The were around $110ish I think.  They also had group 24 AGM's for $159.  The CCA was 875 I think (more than the group 27) and 120 min res capacity (same as the deep/crank).  That might be a goodoption if you don't have space for the Group 27.  Price is good for AGM and they don't need water.


Edited by Canuck, 23 April 2017 - 01:03 PM.


#16 b_cdot

 
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Posted 23 April 2017 - 02:05 PM

I got a great gift for xmas this year. I got one of those power boost dealies. Compact booster pack. Great idea for the boat. Takes up no space

#17 b_cdot

 
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Posted 23 April 2017 - 02:06 PM

I was in Costco in Mississauga this AM.  They have both the big group 27 deep cycle/cranking as well as group 24 pure deep cycle.  The were around $110ish I think.  They also had group 24 AGM's for $159.  The CCA was 875 I think (more than the group 27) and 120 min res capacity (same as the deep/crank).  That might be a goodoption if you don't have space for the Group 27.  Price is good for AGM and they don't need water.



Gonna definitely look into agm type batteries

#18 stonefish

 
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Posted 23 April 2017 - 06:14 PM

I was in Costco in Mississauga this AM.  They have both the big group 27 deep cycle/cranking as well as group 24 pure deep cycle.  The were around $110ish I think.  They also had group 24 AGM's for $159.  The CCA was 875 I think (more than the group 27) and 120 min res capacity (same as the deep/crank).  That might be a goodoption if you don't have space for the Group 27.  Price is good for AGM and they don't need water.


That's a good deal on AGM 👍

#19 porkpie

 
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Posted 23 April 2017 - 09:11 PM

I was in Costco in Mississauga this AM.  They have both the big group 27 deep cycle/cranking as well as group 24 pure deep cycle.  The were around $110ish I think.  They also had group 24 AGM's for $159.  The CCA was 875 I think (more than the group 27) and 120 min res capacity (same as the deep/crank).  That might be a goodoption if you don't have space for the Group 27.  Price is good for AGM and they don't need water.


Thanks, I'll take a look at the AGM's

#20 Sinker

 
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Posted 24 April 2017 - 10:28 AM

Ive load tested it my cranker and it drops to 10.6 volts when i start it. Ill push it for some more trips but i will likely be replacing this year. Going to give my terminals a good cleaning today since i saw a bit of oxidization when i looked the other day


I wouldn't trust that battery. It shouldn't drop that much.

S.





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