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Old 26-04-2015, 08:44   #31
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Re: What be a high capacity battery, and which with thickest plates?

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Originally Posted by darylat8750 View Post
Nice batteries but $$$$ and heavy to move in and out. Also not availble at Sam's or Costco.
Costco = Chinese junk
East Pen = American quality
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Old 26-04-2015, 09:32   #32
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Re: What be a high capacity battery, and which with thickest plates?

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Originally Posted by Nlarsin01 View Post
Costco = Chinese junk
East Pen = American quality
So in essence what you just said is that interstate batteries are Chinese junk

One little question what is the technical information you are baseing your statement on provide links please
I have not had any problems with any equipment purchased from Costco
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Old 26-04-2015, 12:56   #33
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Re: What be a high capacity battery, and which with thickest plates?

5 years ago I was in Mexico and needed batteries. Bought 8 golf cart batteries from Costco for around $600 US. These batteries got hammered last spring as when on the hard the power cord got disconnected and it was several weeks before I got back to the boat and found the problem. Lost several pounds of meat in the freezer. Batteries are still still functioning but not what they used to be. I am keeping my eye on the LiFepo systems but will most likely get the East Penn manufactured 6 volt golf cart batteries from Sam's. I'm price sensitive and cost per cycle is the primary issue.

Properly vented no smells get into my cabin.
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Old 26-04-2015, 13:24   #34
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Re: What be a high capacity battery, and which with thickest plates?

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Costco = Chinese junk
East Pen = American quality

Costco batteries are made by (JCI) Johnson Controls / Interstate....
In approx of the Sam's Club locations the batteries are also made by JCI and the other half by East Penn / Deka.
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Old 26-04-2015, 13:25   #35
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Re: What be a high capacity battery, and which with thickest plates?

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Using voltage to gauge battery capacity requires that you have no load on them for 24 hours.


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My understanding is that the issue here is surface charge on the plates, from charging. It can be dissipated by waiting for 24 hours, but I believe it can also be dissipated by drawing some current from the battery, say at C/10 to C/20. In my case, I turn all the nav lights on for 10 minutes (about 10A). Then I turn them off, and wait for another 10 minutes. This may not be quite as accurate as waiting for a day, but it works for me and has the advantage of being practical.
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Old 26-04-2015, 13:47   #36
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Re: What be a high capacity battery, and which with thickest plates?

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Originally Posted by Sailor Doug View Post
Using voltage to gauge battery capacity requires that you have no load on them for 24 hours.


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Have to disagree.

Been using a built in digital voltmeter, wired direct to the batteries, for more than ten years. As an experiment I disconnected the house bank from the boat one night and took readings every hour during the night until I finally had to reconnect the batteries in the morning (fridge). I wrote down the readings every hour and still have that list somewhere in my boat papers box.

After the first two readings, two hours, they hardly changed at all. On the order of hundreths of a volt. These were four fairly new golf cart batteries.

Those battery monitors may be wonderful but considering the expense and complexity I prefer my simple digital voltmeter; bought it new for ten bucks at an electronics hobby store. Just two wires to hook up. No complex regulating routine either.

I have also found that, having become one with my boat, I know about what my draw is at any given time and pretty closely through a day.
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Old 26-04-2015, 13:55   #37
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Re: What be a high capacity battery, and which with thickest plates?

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Originally Posted by onestepcsy37 View Post
Have to disagree.

Been using a built in digital voltmeter, wired direct to the batteries, for more than ten years. As an experiment I disconnected the house bank from the boat one night and took readings every hour during the night until I finally had to reconnect the batteries in the morning (fridge). I wrote down the readings every hour and still have that list somewhere in my boat papers box.

After the first two readings, two hours, they hardly changed at all. These were four fairly new golf cart batteries.
Battery manufacturers recommend 1 to 2 hours to allow surface charge to dissipate
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Old 26-04-2015, 15:09   #38
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Re: What be a high capacity battery, and which with thickest plates?

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Battery manufacturers recommend 1 to 2 hours to allow surface charge to dissipate
Trojan:
7.4 Open Circuit Voltage Testing
This is the least preferred method of evaluating the condition of a battery.
For accurate voltage readings, batteries must remain idle at least 6 hours (but preferably up to 24 hours).

Deka:
*The “true” O.C.V. of a battery can only be determined after the battery has been removed from the load (charge / discharge) for 24 hours.

Odyssey:
The OCV of a battery is the voltage measured between its positive and negative terminals without the battery connected to an external circuit (load). It is very important to take OCV reading only when the battery has been off charge for at least 6-8 hours, preferably overnight.
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