01-13-2019, 02:03 PM
This battery seems to settle into the 13.20v range for full charge rested voltage in 2 to 3 days. I've only done a few minor skim the top and quick recharges to it since, and the amps refuse to taper to under 0.13@14.7v before they start rising again.
I tried to pry some more info out of Mightymax battery regarding what charge parameters and sort of mocked them and their marketing. They have not followed up other than to asked my name and where it was shipped.
In good light I saw that my battery has a may 2018 date code, so it sat for 7 months self discharging.. The 12.87v it arrived at, is certainly a lot lower than the 13.25v it rests fully charged at.
How long these batteries sit and self discharge and how much capacity they actually lose in that time, never to be recovered, is of course an unknown along with the many other unknowns.
I certainly have recycled all the parts from many jumper packs, and will be using a set of the clamps and cables as a portable set up on this battery, at some point. These currently have 45 amp anderson powerpoles on them which I do not really want to be briefly passing 140+ amps for starter motor current, as at some point I will see if this battery by itself can crank and my v8 engine. I'm still debating how I want to rig this battery up to make it quick to remove and jump another vehicle or act as a portable 12vDC source
No doubt recharging these monthly if unused is very wise. My intial recharge after the deep cycle showed that at 13.6v amps tapered to zero indicating no more charging was occurring, but then a boost back upto 14.7 revealed it was not quite full. The premature float of most automatic chargers will still cause premature degradation of capacity, but whether this is worthy of getting upset over is of course subjective. The ideal AGM recharge parameter for this battery is an unknown, but AGMs can be tickled to death with too low of charge current.
With AGMS bringing the volts to 14.7ish and seeing how many amps it takes is very informative as to state of charge. i really expected amps to taper to lower than they do on this battery, and perhaps that behavior will change as it ages.
checking flooded batteries with a hydrometer is nice for another data point, but messy, verification of state of charge, so since i have the wattmeter going anyway on any battery I recharge, the elimination of the hydrometer is a bonus.
Not knowing hom many amps the battery is accepting at whatever voltage the charging source has decided upon, is kind of like driving somewhere, without a map, but also not knowing the starting point, the destination, or how fast one is going to drive.
I tried to pry some more info out of Mightymax battery regarding what charge parameters and sort of mocked them and their marketing. They have not followed up other than to asked my name and where it was shipped.
In good light I saw that my battery has a may 2018 date code, so it sat for 7 months self discharging.. The 12.87v it arrived at, is certainly a lot lower than the 13.25v it rests fully charged at.
How long these batteries sit and self discharge and how much capacity they actually lose in that time, never to be recovered, is of course an unknown along with the many other unknowns.
I certainly have recycled all the parts from many jumper packs, and will be using a set of the clamps and cables as a portable set up on this battery, at some point. These currently have 45 amp anderson powerpoles on them which I do not really want to be briefly passing 140+ amps for starter motor current, as at some point I will see if this battery by itself can crank and my v8 engine. I'm still debating how I want to rig this battery up to make it quick to remove and jump another vehicle or act as a portable 12vDC source
No doubt recharging these monthly if unused is very wise. My intial recharge after the deep cycle showed that at 13.6v amps tapered to zero indicating no more charging was occurring, but then a boost back upto 14.7 revealed it was not quite full. The premature float of most automatic chargers will still cause premature degradation of capacity, but whether this is worthy of getting upset over is of course subjective. The ideal AGM recharge parameter for this battery is an unknown, but AGMs can be tickled to death with too low of charge current.
With AGMS bringing the volts to 14.7ish and seeing how many amps it takes is very informative as to state of charge. i really expected amps to taper to lower than they do on this battery, and perhaps that behavior will change as it ages.
checking flooded batteries with a hydrometer is nice for another data point, but messy, verification of state of charge, so since i have the wattmeter going anyway on any battery I recharge, the elimination of the hydrometer is a bonus.
Not knowing hom many amps the battery is accepting at whatever voltage the charging source has decided upon, is kind of like driving somewhere, without a map, but also not knowing the starting point, the destination, or how fast one is going to drive.
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