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05-03-2021, 07:55 PM | #11 | |
Gone Wild
Join Date: Oct 2016
Location: Dundee quebec
Posts: 3,190
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Re: Is "topping off" batteries daily, best for longer battery life?
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05-04-2021, 10:38 AM | #12 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Is "topping off" batteries daily, best for longer battery life?
Quote:
I've had the same thoughts and questions you have, but have never able to nail down any absolutes since what constitutes a cycle appears to be a variable quantity, more of an advertising term than an engineering one. What I have been able figure out is sulfuric acid combines with the lead and lead-dioxide of the battery plates to form lead-sulfate when the battery is discharged and the lead-sulfate is converted back to lead, lead-dioxide and sulfuric acid when recharged. When first formed, the lead-sulfate is in an amorphous (soft) state and converts back into lead, lead-dioxide and sulfuric acid fairly easily, but as soon as it is formed, a crystalline latticework starts building within the amorphous (soft) lead-sulfate, converting to to crystalline (hard) lead-sulfate, which takes a lot more energy to convert back into lead, lead-dioxide and sulfuric acid. Crystalline lead-sulfate accumulating on the plates of lead-acid batteries is the natural ageing process that eventually kills them. So the trick is to minimize the amount of time the naturally occurring soft lead-sulfate has to crystallize be recharge the battery as soon as possible and practical after use, regardless of how much it has been discharged. Attachment-1 is the most definitive statement I have received from any battery manufacturer about "Opportunity charging", but you have to be careful searching that term online since it has more than one meaning. Here it means plug in your regular charger whenever the opportunity presents itself, but in other places it means using a higher amp charger instead of the normal one. I've also included the complete document in PDF format as well as the US Battery chart showing DoD vs cycles. (DoD is the reciprocal of SoC) I have similar charts or data for all four of the brands shown on the chart I posted earlier, but they aren't as well identified as to which brand it is for as the US Battery chart is. ------------ Incidentally, some of the crystalline lead-sulfate can be broken down when enough energy is used. That is why back-to-back charging sometimes helps a battery pack that won't take a full charge. |
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