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10-27-2013, 03:04 PM | #1 |
Not Yet Wild
Join Date: Jun 2013
Location: South Carolina
Posts: 13
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Battery specific gravity
I put a new set of 8 volt batteries in my cart back in June. Whenever I check specific gravity after charging and resting, I get a temperature corrected reading of approximately 1.250 in each cell every time. According to my hydrometer, this indicates a "fair" reading. A "good" reading starts a about 1.260 on the hydrometer. Does a reading of 1.250 seem about normal? What do you guys get when you check?
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10-27-2013, 05:18 PM | #2 |
Gone Wild
Join Date: Aug 2009
Posts: 14,245
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Re: Battery specific gravity
I've never really used a real hydrometer to check batts (only used the ones with the colored beads. Hopefully someone who has will chime in...
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10-28-2013, 12:07 AM | #3 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Battery specific gravity
(SG = Specific Gravity) I have done lots, with alot of battery/charger combos. i feel that 1.250 is at the low end of "good". i consider anything between 1.250 and 1.300 good, sure, i would like to see 1.280 or higher. A higher "on-charge voltage" at the end of charge will result in higher SG numbers, so a properly charged US battery should have a little higher number than a Trojan, based on what i have seen. Some OEMs require SG tests for battery warranty, AND individual "on-charge" voltages. I prefer to use individual battery voltages to monitor battery health. To me, these SG tests are somewhat wasted time anyway, so what if a battery cell has a bad individual cell, You gonna cut the battery open and change that specific cell? What benefit did that test provide to that bad battery that wouldn't have been revealed by a quicker voltage test? If you feel the need to test and ensure that you are getting a full charge, go for it. Using SG tests often is overkill in my opinion.
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10-28-2013, 10:18 AM | #4 |
Not Yet Wild
Join Date: Jun 2013
Location: South Carolina
Posts: 13
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Re: Battery specific gravity
Thanks cg. I always get good bank voltage and balanced voltages between the batts after charging (100% charge or slightly better by the chart I've seen here). I've just been wondering why the SG wasn't matching up. I, like you, always thought voltage was a pretty good indicator of battery condition.
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10-28-2013, 10:24 AM | #5 |
Gone Wild
Join Date: Sep 2010
Posts: 879
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Re: Battery specific gravity
And "voltage under LOAD" an even better one......
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10-28-2013, 10:46 AM | #6 | |
Gone Wild
Join Date: Aug 2011
Location: Bunnell, Florida
Posts: 2,408
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Re: Battery specific gravity
Quote:
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10-28-2013, 12:06 PM | #7 | |
Getting Wild
Join Date: Jun 2008
Posts: 96
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Re: Battery specific gravity
Quote:
Kind of related, the tar filled battery's are where the "don't store battery's on a concrete floor, always put them on a board" practice came from. Otherwise the battery would discharge if placed directly on concrete. Modern "plastic" cases don't require this. |
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