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Open Roads Forum  >  Tech Issues

 > Reviving flooded deep cycles

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wopachop

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Posted: 01/10/21 12:45pm Link  |  Quote  |  Print  |  Notify Moderator

Im still trying to wrap my head around 2 batteries in series, powering a light bulb for months, and only 1 battery died.

Now given i have not taken SG measurments. I picture the 2 batteries as 1 single larger battery. Since it was two 8v that are 4 cells each lets call it an 8s battery.

Its so weird how 4 of those cells were drained to zero. While the other 4 were depleted but not dead. While not identical in age and brand they are similar in capacity. I dont know if the voltage regulator and LED lights were still drawing small amounts of power when i discovered the dead battery. Its possible the battery that was drained low was on its way to being completely dead too. But the lights have been on for months. I would have expected 2 dead batteries. Maybe the voltage regular broke and stopped drawing power. Variables


....
Actually i was sitting here thinking. I think thats the answer....the voltage regulator. It has a little potentiometer that you turn to adjust output voltage. I bet as the battery voltage dropped, eventually the output voltage got down to zero. Thats why the 2nd battery was not drained to zero.

If it was a standard light bulb i would most likely have had 2 dead batteries? Its still interesting how the 1 year old battery is the battery that drained first. At some point i will have to weight the difference between the newer off brand battery and the old Trojan 8v.

MEXICOWANDERER

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Posted: 01/10/21 12:52pm Link  |  Quote  |  Print  |  Notify Moderator

Im still trying to wrap my head around 2 batteries in series, powering a light bulb for months, and only 1 battery died.

A battery in series can go 100% open circuit. One cell or all cells. It's acts like an off switch.

wopachop

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Posted: 01/10/21 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

Does it turn open circuit because of a mechanical failure? Or does the chemistry flip back and forth?

It's strange how my charger voltage display will turn on and off, just as if the battery was a switch and turning on and off. Just seems like a mechanical failure would be permanent. So I dont think it's that.

wopachop

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Posted: 01/10/21 04:23pm Link  |  Quote  |  Print  |  Notify Moderator

Would it be a mistake to go straight into equalization charge voltage?
I started with a 5a charge for maybe 5 hours. Then it was a 7a charge today for a few hours.

Now im using my nice charger. Its taking 12a to maintain 2.45v per cell. I have it set to a 20a charge. But currently its taking 12a.

Would it be better to try and shake the plates clean using a 2.7v per cell charge?

wa8yxm

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Posted: 01/10/21 04:39pm Link  |  Quote  |  Print  |  Notify Moderator

Never seen 8 volt batteries before

Why did one die and not the other.
Very unusual for two batteries even if they are "Twins" to be identical
one cell will always die first.


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wopachop

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Posted: 01/10/21 04:46pm Link  |  Quote  |  Print  |  Notify Moderator

Im still confused to it. I basically had 1 giant battery with 8 cells in series. Yet the 4 cells on the black battery drained to zero. While the 4 cells on the 10 year old trojan battery maintained voltage. Super super low at 7v but not completely down to zero volts like the other battery.

Maybe what im failing to comprehend is that the 8v battery drained to 7v was also completely dead. Maybe there isnt much difference between 0 volts and 7v when you are talking about 8v batteries?

Hope that makes sense.

wopachop

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Posted: 01/10/21 04:52pm Link  |  Quote  |  Print  |  Notify Moderator

Decided to use my SG tool. Im a weirdo and didnt want to use it on anything but my brand new costco 6v. I dont want some old crappy batteries getting it dirty inside. I dont know the history of them old trojans. Then remembered this black battery was brand new and im the only one who has touched it. So i know besides at the factory no dirty water or dust has gotten inside.

Hard to see but its not even registering at the lowest 1.100 mark yet. That was interesting to see. Shows how much SG tells you. I took the reading while the battery was absorbing 12a at 2.45v per cell.

[image]

[image]

MEXICOWANDERER

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Posted: 01/10/21 05:22pm Link  |  Quote  |  Print  |  Notify Moderator

32 volts was the standard USA rural electrification standard in the US.
Many commercial marine vessels are 32 volt 16-cell systems.
(4) 4 cell batteries. 37.5 voltage regulator bulk setting.

time2roll

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Posted: 01/10/21 05:33pm Link  |  Quote  |  Print  |  Notify Moderator

If you want to attempt to revive a battery best I can say is to give it an equalization charge at 2.5 to 2.7 volts per cell. Keep going as long as the specific gravity is increasing in all cells until you reach full charge. MEX might have better details.


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wopachop

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Posted: 01/10/21 05:40pm Link  |  Quote  |  Print  |  Notify Moderator

I can go out there and change the charge voltage right now. Its on a golf cart i have it outside in the middle of nowhere in case the sucker burst into flames.

In order to do a 2.7v charge i have to trick the charger. Call the 4s battery a 5s and then reduce the voltage. It wont let me go up to 2.7.

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