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100AH 12V Batteries not holding float charge anymore after only a month

Your batteries need to be equalized at 15.3v for 8 hours. Twice.
 
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Please work in a Solar RV install shop for just one season, please SolarRat. See how batteries are abused by undercharging/over discharging and what is the fix/temporary patch? Equalizing.
 
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Please work in a Solar RV install shop for just one season, please SolarRat. See how batteries are abused by undercharging/over discharging and what is the fix/temporary patch? Equalizing.

Just because you got a hammer doesn't mean every problem is a nail.
 
Every document I've read, apart from the ones produced by lifetime, says do not, for various reasons. My own view is do not because doing so will split the electrolyte faster than the typical SLA battery can recombine it and that is bad for a battery in which there isn't a lot of free electrolyte in the first place (AGM in this case) and in which the user can't replace lost water due to the fact that it is 'sealed'. I have read concerns about the potential for a battery to explode but that is highly unlikely because the vents will start releasing gas around 2psi over atmosphere.

There is also a huge amount of confusion out there on various forums because people don't grasp the difference between a flooded cell (open or sealed) and AGM, gel types.

That said, if the battery is cack already nothing is lost by doing an equalisation charge on an AGM. If it does bring it back to a usable state but with a lower overall capacity due to reduction in electrolyte availability it's better than not having a working battery at all.

Doing this to a gel battery will destroy it. Doing it to a correctly working AGM will degrade it.
 
Thats true with AGM and gel. Not true with FLA. Stratification of the acid happens along with cell imbalance. Equalization is needed and sometimes can need over 16v. You have to measure with a hydrometer to do it the right way.
 
Sealed flooded batteries have, or should have, different cell plate spacing to try to offset the effects of stratification given that they can't be equalise charged without depleting the electrolyte. I've mentioned this in prior posts about charging voltages.
 
Some sealed battery manufacturers suggest equalization when needed. As I understand it one is 3 months old with at least 5 dozen cycles. Def not brand new.

Conditioning should only be done when the battery is showing symptoms of capacity loss due to extended time in a partial or low state of charge condition. This could be caused, for example, by low charging voltage for an extended number of charge cycles, or by repeatedly charging to
only 90% state of charge.
NOTE: Some chargers use the term Equalizing Charge instead of Conditioning Charge. An Equalizing Charge is generally applied to flooded lead acid batteries that are susceptible to acid
stratification. However, an Equalizing Charge may be used to provide a Conditioning Charge for Lifeline® batteries as described below.
To apply a conditioning charge, first go through the normal charge cycle to bring the battery to full charge. The conditioning charge should then be applied by charging for 8 hours. At 77°F (25°C), the conditioning voltage should be set at 2.58 VPC (15.5 volts for a 12 volt battery). The
conditioning voltage at other temperatures is shown in Table 5-2. By using the temperature-
compensated conditioning voltage, batteries that are not in controlled temperature environments may be conditioned without bringing them to room temperature. If temperature compensation is not available, it is best to bring the battery as close to room temperature as possible before applying the conditioning charge.
 
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Sorry guys I learned to work in real world, not paperwork. Paperwork is messy and tech support lies because most are clueless. And gel is off the table never dealt with any.
 
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