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Unread 12-14-2008, 05:02 AM   #1
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Default Using a Hydrometer on an 8v battery

Just looking for validation here, when using a hydrometer I am assuming that the specific gravity chart for what is a good or bad cell is the same regardless of the voltage of the battery, correct? In other words the same scale for a 12v would apply to an 8v.
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Unread 12-14-2008, 08:11 AM   #2
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Default Re: Using a Hydrometer on an 8v battery

Yes, the difference in voltage is a result of the number of cells of 2+ volts each connected in series within the battery. That is why a 6v has 3 cells and an 8v has 4
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Unread 12-14-2008, 10:43 AM   #3
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Default Re: Using a Hydrometer on an 8v battery

I fully understand Scotty, but that's not what I am asking. I am specifically asking if the specific gravity is different between a 12v, 8v or 6v battery, from what I read it's not, only the voltage will change due to the different number of cells. This seems to be a common scale for which to go by.
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Unread 12-14-2008, 12:00 PM   #4
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Default Re: Using a Hydrometer on an 8v battery

Yes.
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Unread 12-14-2008, 12:23 PM   #5
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Default Re: Using a Hydrometer on an 8v battery

Voltage has no bearing. You are measuring specific gravity of each cell, not the entire battery. You need to measure the electrolyte under every cap of every battery. Each cap represents it's own cell.
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Unread 12-14-2008, 12:56 PM   #6
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Default Re: Using a Hydrometer on an 8v battery

Quote:
Originally Posted by cheapjeep2 View Post
Just looking for validation here, when using a hydrometer I am assuming that the specific gravity chart for what is a good or bad cell is the same regardless of the voltage of the battery, correct?
Correct, but just keep in mind one must know the temp of the battery, and then use the adjusted SPG. Most charts are for 77 degrees and do not adjust for the difference in temp. For that you will need to cunsult the manufacture specifications.
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Unread 12-14-2008, 02:37 PM   #7
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Default Re: Using a Hydrometer on an 8v battery

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Originally Posted by gornoman View Post
Voltage has no bearing. You are measuring specific gravity of each cell, not the entire battery. You need to measure the electrolyte under every cap of every battery. Each cap represents it's own cell.
Yea, I figured that!
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Unread 12-14-2008, 02:38 PM   #8
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Default Re: Using a Hydrometer on an 8v battery

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Originally Posted by dereckbc View Post
Correct, but just keep in mind one must know the temp of the battery, and then use the adjusted SPG. Most charts are for 77 degrees and do not adjust for the difference in temp. For that you will need to cunsult the manufacture specifications.
The Hydrometer I bought has a temperature gauge built into and has the calculations. So I'm good.

Thanks all.
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Unread 12-14-2008, 06:40 PM   #9
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Default Re: Using a Hydrometer on an 8v battery

I can see where that would be confusing as the specific gravity chart correlates sg to battery voltage on a 12V battery.
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Unread 12-15-2008, 10:09 AM   #10
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Default Re: Using a Hydrometer on an 8v battery

Yes it could throw one off except for the fact that as stated above,
you are really measuring each cell.
So it matters not whether the battery has 6 cells (12 Volt) , 3 cells (6 Volt) or 4 Cells (8 Volt) since it's per cell .
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