Which battery maintainer out of two?

[2515R Dude]

Another question:
I have two chargers/maintainers.
The first one after connecting pretends to disulfate, charge and after it charged the battery to 100% it keeps constantly fluctuating from 13.4V to 13.55V non stop.
The second one does the same but after charging the battery to 100% at ~13.5V it slowly drops to 12.7V and stays there forever.

Which one do you think is a good charger and behaves correctly for winter/long time maintainer?

 

[5030]

Not a clue but I use both 'Battery Tenders' and Yuasa tenders.

Far as I'm concerned that desulfation stuff is phooey anyway.

Plate sulfation is a natural occurrence in ANY flooded cell or AGM battery and the prime reason why batteries fail because as the sulfation increases on the plates, they loose their ability to store the electrical charge and ultimately, the sulfation that does flake of the plates, drops to the bottom of the case and eventually shorts the plates and causes the battery to fail (and why battery manufacturers design the case with a space at the bottom so the sulfate can collect without shorting the plates).

I don't buy into the desulfation stuff one bit.

 

[LittleBill21]

13.2 is the proper float voltage for most batteries.

 

[2515R Dude]

13.2 is the proper float voltage for most batteries.

So, the first one is the correct one and the second is just a fake advertisement?

 

[LittleBill21]

no its prolly a manufacturing issue, I would use the second one, but throw the battery on a equalize charge when you plan to use it

 

[2515R Dude]

no its prolly a manufacturing issue, I would use the second one, but throw the battery on a equalize charge when you plan to use it

The reason i asked all those questions here, i know nothing about the subject, so, please be patient with me.

Second one is producing only 12.7V contrarily to what you say 13.2V is better. Also, it fluctuating, in my understanding it is the floating charge which is whole gimmick, isn't it?

However, i have concern if leaving the battery the whole winter under fluctuating 13.4v-13.55V would all the electrolyte evaporate?

 

[LittleBill21]

The reason i asked all those questions here, i know nothing about the subject, so, please be patient with me.

Second one is producing only 12.7V contrarily to what you say 13.2V is better. Also, it fluctuating, in my understanding it is the floating charge which is whole gimmick, isn't it?

However, i have concern if leaving the battery the whole winter under fluctuating 13.4v-13.55V would all the electrolyte evaporate?

13.4 should not be a issue, I would check the water, but that voltage should not cause gasing.

float charge means a certain voltage level, which is a reduced voltage from the charging level, to reduce the amount of water lost in the battery. This is not a gimmick,

the pulsing during a desulfating cycle is questionable how effective it is in keeping the plates clean, again i would use both, 12.7 is still better then nothing.

 

[Cycledude]

Have you load tested the battery ?
I suspect your battery might be going bad.
I am a firm believer in chargers with built in desulfurization mode.
Exactly what chargers do you have ?

 

[2515R Dude]

13.4 should not be a issue, I would check the water, but that voltage should not cause gasing.

float charge means a certain voltage level, which is a reduced voltage from the charging level, to reduce the amount of water lost in the battery. This is not a gimmick,

the pulsing during a desulfating cycle is questionable how effective it is in keeping the plates clean, again i would use both, 12.7 is still better then nothing.

Ok, let me summarize what i understood and correct me if i'm wrong again.
1. Both chargers are good but the first one with 13.4v-13.55V is slightly better
2. The fluctuation in the maintenance stage has questionable benefits but does not have any ill effect on a battery.
3. Both of them safe to leave connected for long period of time like 6 month while my boat is not used or tractor when not used for long time

Have you load tested the battery ?
I suspect your battery might be going bad.
I am a firm believer in chargers with built in desulfurization mode.

Yes i have, all of them 100% good, the oldest one is less than 4 YO, the rest are from 6 month old to 2YO. I have 12 of them in all my machines.

The reason i ask all the question, previously i had only two chargers and in the OFF time every first of the month i was running among my batteries charging them. It became old very quick when i got more and more toys, so i started buying chargers and noticed all of them perform differently, i connect a simple voltmeter to monitor the progress.
Hence the questions, which way is the right way.

 

[LittleBill21]

1 yes
2 fluctuation is a non issue.
3 yes its fine, but always check the water after several months to get a base pattern on/if there is water loss.