Notices
Marine Electronics Forum

Dead Battery Question!!!

Old 02-20-2015, 07:35 AM
  #1  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2013
Posts: 235
Likes: 0
Received 13 Likes on 11 Posts
Default Dead Battery Question!!!

Hope this in the right forum. My boat has had a dead battery the last two times out. It has sat for awhile before each use. Never had this problem until now, possibly because the boat is used weekly in the summer. Removed it from the boat and charged it, let it sit for 3 weeks then took it to a auto parts store to "load test" it. They stated all was well, 12.3 volts and over the printed 550 cca. I have tested the boat and came up with the circuit that my radio is on drawing .03 amps. Doesn't seem like much to me. Guessing that it is typical for the memory.
Anyone know how long it would take a battery to draw down , DIE, at this rate. It is a dual purpose battery and also has the following information printed on it. 23amp ave 140 min. 550cca Thanks for your help!!
Old 02-20-2015, 08:33 AM
  #2  
Senior Member
 
Join Date: Nov 2010
Location: OBX
Posts: 2,938
Received 223 Likes on 143 Posts
Default

How old is the battery? If you're drawing power from it, and it's cold, and an older battery, you could be left with a dead battery in a week or two.
Old 02-20-2015, 08:38 AM
  #3  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2013
Posts: 235
Likes: 0
Received 13 Likes on 11 Posts
Default

Thats kinda what I'm thinking.....
I thought maybe there was a calculation out there that might actually assign this equation with an answer along the lines of (X) amount of days. My judgement tells me that it is combination of all things just mentioned. The battery is almost two years old and some of these less expensive batteries only last 2 years. Although I have had the same quality/brand batteries last in upwards of 4 years with the same factors
Old 02-20-2015, 08:41 AM
  #4  
Senior Member
 
Join Date: Mar 2008
Location: mass.
Posts: 5,593
Likes: 0
Received 50 Likes on 17 Posts
Default

You need to do a parasitic draw test at the battery to determine the exact amount of parasitic draw on the battery. From there finding the source/s of the entire draw should be relatively easy one circuit at a time..
Old 02-20-2015, 08:45 AM
  #5  
Senior Member
 
Join Date: Nov 2010
Location: OBX
Posts: 2,938
Received 223 Likes on 143 Posts
Default

do you have a need to have the radio (or anything else) receive constant power? I dgaf about my stereo presets so I make sure I'm off on my main switches before I leave the ramp at the end of the day. I'd either look at a trickle charger, solar or otherwise, to keep it topped off in your situation.
Old 02-20-2015, 09:02 AM
  #6  
THT Sponsor
THT sponsor
 
Join Date: Jun 2014
Location: St. Petersburg, FL
Posts: 1,912
Likes: 0
Received 10 Likes on 6 Posts
Default

You could have a bad cell, I've seen 3 month old batteries that would load test fine and provide 12 volts still have a bad cell thus allowing for a dead battery in a very short time and that with boats that have the whole electrical system on a switch that is turned off. But to be sure as mentioned above you should check the whole system for a large drawdown somewhere, but I bet it's your battery. Here in FL if you get 3 years out of a Battery that you don't have on a trickle charge (aka solar panel) or on a Battery Maintainer you're doing damn good.
Old 02-20-2015, 09:22 AM
  #7  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2013
Posts: 235
Likes: 0
Received 13 Likes on 11 Posts
Default

Not going to even ask how to do a parasitic draw, Im not that interested. Everything is on a battery switch except the radio and I know the drain is the radio. I have unplugged it and all amps (.03) stop.
Will a radio hold a station if the yellow memory wire is disconnected? Im under the impression that this is the only NEED for the yellow wire. I dont want to have to constantly reprogram stations everytime I launch the boat. I cant see anyone else wanting to go through that issue at launch either.
I dont want to over analyze this and start talking about full moons and incoming tides affecting or effecting this. I just thought that someone else might have crossed this path before. Thanks to all who have answered and ALL input was appreciated! Have fun boating/fishing.
Old 02-20-2015, 09:38 AM
  #8  
THT Sponsor
THT sponsor
 
Join Date: Jun 2014
Location: St. Petersburg, FL
Posts: 1,912
Likes: 0
Received 10 Likes on 6 Posts
Default

sshipman350, you know my 1st instinct is to tell you yeah the yellow wire needs to be hooked up directly to retain your settings, but it also might depend on your stereo model/brand. I say this because I connected Fusion IP600's red(switched power) and yellow(12+) wires together and it's connected to my main battery switch and it retains all of my settings when I switch the power on. What radio do you have? I still think it's your battery though, not the radio draw...but if you plan on keeping the radio connected directly I would still get a small solar powered battery maintainer they're usually $30 or so. That way it would cancel out the minimal draw from the radio and just sitting.
Old 02-20-2015, 09:49 AM
  #9  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2013
Posts: 235
Likes: 0
Received 13 Likes on 11 Posts
Default

I think I will give that a shot. I agree it probably is a weak battery and of coarse it will have to be replaced . Now or Later. A trickle charger is the best thing for it just to improve the battery life anyways. Great suggestion.
Think I might remove the power to the yellow wire and see how long it holds a preset. Your (and maybe mine) has to have a capacitor built in it to "keep" power in the event of battery failure. Guess I will see how long this capacitor will supply power. If it is long term, AWESOME!
Old 02-20-2015, 09:54 AM
  #10  
Senior Member
 
Join Date: Aug 2014
Location: Marina del Rey, Ca
Posts: 1,379
Likes: 0
Received 41 Likes on 31 Posts
Default

Keep the batteries charged. You could provide the stereo with its own small battery, independent of the boat's electrical system, and charged through a combiner (or other).
Old 02-20-2015, 10:23 AM
  #11  
Senior Member
 
Join Date: Jun 2014
Location: Middle Sound, NC
Posts: 9,558
Received 2,055 Likes on 1,295 Posts
Default

Assuming a 70Ah batt, typical of a group 27, a 0.03A drain will take it to 50% in 48 days. My actual experience is that batts go downhill faster than the calc would indicate.

Either turn off all loads with a switch, or put a trickle charger on.

Also, the load test does not tell if batt has an internal drain, so batt still could be iffy.
Old 02-20-2015, 11:07 AM
  #12  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Feb 2013
Posts: 235
Likes: 0
Received 13 Likes on 11 Posts
Default

Corndog, This is group size 24. Any idea on that?
Old 02-20-2015, 11:16 AM
  #13  
Senior MemberCaptains Club Member
 
Join Date: Nov 2006
Location: boynton beach fl
Posts: 4,743
Received 149 Likes on 111 Posts
Default

Originally Posted by mahimahi99 View Post
sshipman350, you know my 1st instinct is to tell you yeah the yellow wire needs to be hooked up directly to retain your settings, but it also might depend on your stereo model/brand. I say this because I connected Fusion IP600's red(switched power) and yellow(12+) wires together and it's connected to my main battery switch and it retains all of my settings when I switch the power on. What radio do you have? I still think it's your battery though, not the radio draw...but if you plan on keeping the radio connected directly I would still get a small solar powered battery maintainer they're usually $30 or so. That way it would cancel out the minimal draw from the radio and just sitting.
accurate info, go with it Test by leaving the radio disconnected till next time...see if the same thing happens and have a new battery with you!
Old 02-20-2015, 11:28 AM
  #14  
Senior Member
 
Join Date: Mar 2008
Location: mass.
Posts: 5,593
Likes: 0
Received 50 Likes on 17 Posts
Default

Originally Posted by sshipman350 View Post
Not going to even ask how to do a parasitic draw, Im not that interested. Everything is on a battery switch except the radio and I know the drain is the radio. I have unplugged it and all amps (.03) stop.
Will a radio hold a station if the yellow memory wire is disconnected? Im under the impression that this is the only NEED for the yellow wire. I dont want to have to constantly reprogram stations everytime I launch the boat. I cant see anyone else wanting to go through that issue at launch either.
I dont want to over analyze this and start talking about full moons and incoming tides affecting or effecting this. I just thought that someone else might have crossed this path before. Thanks to all who have answered and ALL input was appreciated! Have fun boating/fishing.
If you KNOW the only thing drawing on the battery is the minute draw of the radio memory and that is what is killing the battery a charger or maintainer is only going to prolong the inevitable to the point it will fail when you need it most.. Replace the battery and be done with it.. A maintainer or charger used to keep a bad battery charged is only masking the problem .
Old 02-20-2015, 12:53 PM
  #15  
Admirals Club Admiral's Club Member
 
Join Date: Feb 2015
Location: Helena, AL
Posts: 487
Received 111 Likes on 61 Posts
Default

I would replace the battery.
Old 02-20-2015, 01:43 PM
  #16  
Senior MemberCaptains Club Member
 
Join Date: Feb 2003
Location: M.Vineyard, MA
Posts: 16,488
Received 1,005 Likes on 777 Posts
Default

You said everything is turned off with the battery switch except the stereo memory and that all current flow stops when you disconnect that.

Does this mean you do not have any bilge pump switches hooked directly (through a fuse) to battery + ?

And if they are hooked up that way as on ~90+% of boats with bilge pumps, do you by any chance have Rulematic pumps which automatrically turn on briefly every 2 minutes or so to check for water resistance?

Only asking as those pumps are infamous for draining batteries , and you may have checked for current when it was between auto-activations.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.