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Old 05-16-2007, 09:46 PM   #29
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Pat, you have it well said, and lots of great info in this thread from others too.
Lew, that was a great way to explain the starting voltage although that it regulated. I think the low resistance actually allows more initial amperage with the same voltage, don't ya think?
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Old 05-16-2007, 10:33 PM   #30
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Lew,
Thanks for your response. Do you think that it would be wise to go with AGM's with the stock charger? What damage could be done to AGM's by overcharging?

Thanks...
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Old 05-26-2007, 06:54 PM   #31
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Originally Posted by romap
Lew,
Thanks for your response. Do you think that it would be wise to go with AGM's with the stock charger? What damage could be done to AGM's by overcharging?

Thanks...
Ron,

A single stage charger in effect puts 14.2-14.4 volts to the battery all the time. The beauty of the 3 stage units is that after reaching a certain charge level....say 80%, the charger automatically drops the voltage for the 'acceptance' charge, and further reduces it at a higher state of charge for the 'float' charge. Some folks might call this last charging state the 'trickle' charge.

AGMs should be removed from the charger once they are fully charged to around 13.2 volts. Even though they have no free liquid electrolyte, the acid that is fully absorbed in the glass sponge WILL GAS thru the vent if the battery is overcharged and potentially damage the cell.

Hope this is clear. Just another reason to use a 3-stage charger......you don't have to worry about the battery state.......it's all automatic!
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Old 05-26-2007, 07:12 PM   #32
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Ron, I don't know how many batteries you have but if you are going to be buying multiple AGMs, ($200-300 each) the expense of a new converter (charger) isn't that much more. ($200 plus or minus).
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Old 06-03-2007, 05:06 AM   #33
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I think the low resistance actually allows more initial amperage with the same voltage, don't ya think?
Agree with you Randy on this statement. I believe lewster's meaning was internal leakage instead of internal resistance. Am I right lewster?
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Old 06-03-2007, 07:23 AM   #34
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Quote:
Originally Posted by FrenchBern
I think the low resistance actually allows more initial amperage with the same voltage, don't ya think?
Agree with you Randy on this statement. I believe lewster's meaning was internal leakage instead of internal resistance. Am I right lewster?
FB,

You are right, but they are the same thing....just terminology. Ohm's law states that: voltage (E) = current (I) X resistance (R) so a battery with lower internal resistance will accept a greater current at any given voltage.

It is the internal resistance in a battery that causes it to self-discharge. The greater this resistance, the quicker the charge dissipates.
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