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Old 02-05-2013, 08:00 PM   #11
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Good research Lou, I had a Thermoil battery in a motor home from Gulf Stream built late 1999. The Oil looked like salad dressing oil, thin and just laid on top. The purpose was to retard gas bubbling from leaving the battery (hydrogen). It may have reduced it but its obvious the gas is very light and some will break through. Oil mfg. I've known to use this principal, adding water puts the H20 back in! Can't see how it retards freeze temp however.
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Old 02-05-2013, 08:32 PM   #12
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Good research Lou, I had a Thermoil battery in a motor home from Gulf Stream built late 1999. The Oil looked like salad dressing oil, thin and just laid on top. The purpose was to retard gas bubbling from leaving the battery (hydrogen). It may have reduced it but its obvious the gas is very light and some will break through. Oil mfg. I've known to use this principal, adding water puts the H20 back in! Can't see how it retards freeze temp however.
Totally seemed like a gimmick to me. If you have a proper 3 stage charger there should be very little or no H2 released as a gas and the hydrogen should stay in solution as Hydrogen ions (H+).

The only time H2 would be released is if the battery was overcharged or charged at a rate too high for the battery to accept and the water would be torn apart by the excess current releasing hydrogen and oxygen as gas. If not vented, this explosive mixture would collect faster than the vents could release it and BANG.

Lead

Discharge

Fully Discharged: Two identical lead sulfate plates

In the discharged state both the positive and negative plates become lead(II) sulfate (PbSO4) and the electrolyte loses much of its dissolved sulfuric acid and becomes primarily water. The discharge process is driven by the conduction of electrons from the negative plate back into the cell at the positive plate in the external circuit.

Negative plate reaction: Pb(s) + HSO−4(aq) → PbSO4(s) + H+(aq) + 2-e

Positive plate reaction: PbO2(s) + HSO−4(aq) + 3H+(aq) + 2-e → PbSO4(s) + 2H2O(l)

The (aq) means aqueous or dissolved in water; so no gas is produced. When discharging, the sulphate from the acid bonds with the lead and the sulfuric acid becomes pure water.

Charging

Fully Charged: Lead and Lead Oxide plates

In the charged state, each cell contains negative plates of elemental lead (Pb) and positive plates of lead(IV) oxide (PbO2) in an electrolyte of approximately 33.5% v/v (4.2 Molar) sulfuric acid (H2SO4). The charging process is driven by the forcible removal of electrons from the positive plate and the forcible introduction of them to the negative plate by the charging source.

Negative plate reaction: PbSO4(s) + H+(aq) + 2-e → Pb(s) + HSO−4(aq)

Positive plate reaction: PbSO4(s) + 2H2O(l) → PbO2(s) + HSO−4(aq) + 3H+(aq) + 2-e

Again, the (aq) means aqueous or dissolved in water; so no gas is produced when charging at a rate that the battery can accept. When charging at the correct pace, the sulphate from the plates bond with the Hydrogen ions in the water and the water becomes sulfuric acid again.

Oil would have no use in either process.
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Old 02-09-2013, 07:32 PM   #13
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I think the oil would retard evaporation of the battery H2O but do little else. If the water were to "boil out" caused by a low quality charger, the oil level would - because oil will float on H2O - go down with the H2O and coat the lead plates, reducing effectiveness and battery life. Don't do it.
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Old 02-09-2013, 08:27 PM   #14
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I've never heard of batt. Acid ever freezing- I would say not posible.... but I'm no scientist? Is it realy possible?
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Old 02-09-2013, 08:33 PM   #15
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Battery acid will in fact freeze if the battery is discharged or dead !
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Old 02-09-2013, 08:42 PM   #16
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The liquid in a discharged battery is essentially water and will freeze. Charged up the liquid is sulfuric acid and will only freeze under REALLY cold conditions like -92f
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Old 02-09-2013, 08:58 PM   #17
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-60 I read somewhere .
And at that temp it looses 70% of capacity .
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Old 02-09-2013, 09:05 PM   #18
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Well that figures, I guess anything will freeze if its cold enough. Thank God it doesn't get in the minus degrees very often here.
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Old 02-09-2013, 09:50 PM   #19
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I've never heard of batt. Acid ever freezing- I would say not posible.... but I'm no scientist? Is it realy possible?
Battery acid becomes water when the battery is dead.
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Old 02-09-2013, 10:15 PM   #20
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Hmmm. So what would neutralize it? Because I know sulfuric acid will remain an acid- as my grandpa use to keep some in old coke bottles.
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