10,8 volt on aux batterie

A battery will make that noise if badly overcharged and venting. Most lead acid batteries will make a very very soft boiling sound while charging

However I really can't explain why it would continue to make that noise after you stopped charging. All I can think of is that the solar panel didn't have a regulator built-in, overcharged the battery, and the safety vent is allowing gas to escape

 

If that really is the output of the panel, that would be barely enough to even charge at all. For example, I use a VDC Electronics Battery Minder on my Prius

 12 Volt-1 Amp  Charger and Maintainer

The maximum regulated charge voltage is 14.4 vdc. Maximum possible charge current is 1.33 amps. Typically, it will float charge at 13.4 vdc and current is regulated 5-200 mA. I have never heard any noise from my auxilary battery while the Battery Minder was hooked up.

What model of solar panel are you using?

 

You have a dead cell in your battery. I suspect a cell is shorted which will overcharge the other cells. Fit a new battery now before it boils dry and fails leaving you stranded. You currently have a 10 volt battery which is charging at 14 volts.
You can check this by removing the battery, remove the filler caps and charging it and you will see that one cell has no or very few bubbles compared to the others.

Get a new battery quickly.

 

Good call. Have never had a battery act like that, but quick research suggests the same.

 

I am sure what can of solar charging system you are using but I suppose if it can produce 12v and no more then you don't need a regulator. I am not sure what maintains those volts unless it is the solar cells themselves. I use a regulator to charge my batteries at our cabin (4/6vdc golf cart batteries) with two 75 panels.

Jayman = if you are reading this, those batteries are at least ten years old in prolong -1C + temps but always hooked up to those solar panels to keep them from freezing.

 

Have some co-workers with cabins who use regulated solar panels at their cabins. They do a great job of keeping the batteries going a long time, +5 years

A shorted battery cell can cause the symptoms described, possibly an explosion if heavy charging is maintained

 

Extremely DANGEROUS and BAD advice... Batteries are EXPLOSIVE and can cause bodily harm. Never open a sealed battery such as this one and look to see if it's "bubbling"... The "bubbles" are EXTREMELY EXPLOSIVE AND FLAMMABLE. I have a very close friend who is an experienced 25 year battery technician who recently had a battery explode in his face blinding him for a year and causing severe acid burns to his face and hands - he became careless and casual about his job and opened the battery in a situation similar to what patsparks is suggesting you do.

DO NOT FOLLOW PATSPARKS ADVICE! This is a case of where the Internet is simply wrong. This post is suggesting you do something that could put yourself in serious physical danger. The slightest spark or electric discharge, static, anything can ignite an unsealed battery!

They dont have warning stickers all over them for fun! They're REAL!

 

Not possible. At 10V your battery is basically flat. Even if the car could run on the lower voltage, the battery will not survive it. There's something else going wrong here...

 

You clearly have a bad battery. A fully charged battery should be ~12.6 volts.

If you are boiling it, you are either putting too many amps in to fast, or you have either a dead cell, or very low water in one or more cells.

In another life, I design and build off grid solar systems. Here are a couple of links to some very good battery sites that all should read.

http://www.batteryfaq.org/


Deep Cycle Battery FAQ

I suggest that you read them,

Icarus

 

You clearly have a bad battery. A fully charged battery should be ~12.6 volts.

If you are boiling it, you are either putting too many amps in to fast, or you have either a dead cell, or very low water in one or more cells.

In another life, I design and build off grid solar systems. Here are a couple of links to some very good battery sites that all should read.

http://www.batteryfaq.org/


Deep Cycle Battery FAQ

I suggest that you read them,

Icarus

 

If the battery is damaged, you can charge it from now until the second tuesday of next week and it still won't hold a charge! Take it out and TEST IT!


(People have the misguided notion that batteries are boxes that you pour electricity into and out of. The fact is that they are chemical plants that MAKE electricity from chemical reaction. If you damage one element of a battery, (Plates, anodes, electrolite etc) the others will NEVER work as designed,,ever!)

Icarus

 

This probably sounds like a stupid question, but can you have low water in a sealed battery? The answer no doubt is that this is not a sealed battery, especially since you can look inside. Then, why does Toyota say that this is a sealed battery? And if it isn't sealed then shouldn't one top it off ocassionally, or is there some special seal that keeps the contents from evaporating off?
Gurgle sounds aren't too bad, boiling sounds? - that's scary - definitely a cooked battery.

 

I am no battery expert but have spilled that liquid on my Carharts. What they look like I would not want my skin to look the same. I would take the above suggestion very seriously, in particular since you have a bubbling
cooker.

 

Which brings up something I have been thinking about today while at work

What happens if the battery vent tube should become kinked, plugged, or in your case if the replacement Toyota battery was installed and the vent tube NOT hooked up?

I think it's rare for a battery to gas this much H2, but say the vent tube was plugged/kinked or disconnected: the H2 would vent into the enclosed car.

I have never had a battery cell "short" out like that, but it's obviously possible. I read the VDC Electronics site about such conditions, and they state the battery has probably been damaged by sulfation and MUST be replaced. It is very unsafe to continue to try to use such a battery

 

Sure, if the battery was ever overcharged for a prolonged time. Or if it developed a leak somehow.

A lot of "sealed" batteries can be opened up with a bit of patience. The caps can be pried off with a screwdriver, or in the case of the Toyota battery a philips screwdriver can sometimes be used to unscrew the recessed cap

The AC Delco (Delphi?) batteries truly are sealed, I am under the impression so are the Optima batteries. The Delco batteries use a gas/liquid separator to minimise electrolyte loss during brief overcharge events.

I've used the Delco batteries in other equipment and currently have one in my old Ford work truck. Highly recommended

 

Please replace the battery for your own safety. Make sure the replacement battery is fully charged before installing it. Pay particular attention to the vent tube correctly attached