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pasusan's avatar
pasusan
Explorer
Oct 02, 2013

Tops of batteries are wet

Hi folks - I've got a question on how to troubleshoot my battery problem.

I've got 2 6 volt batteries wired correctly and a Progressive Dynamics 4600 series converter with charge wizard. The batteries live in a galvanized box with a tray that slides in and out (from the factory).

While checking the water level before our last trip I saw that there was a little wetness on the tops of both batteries and there was evidence that it had trickled down the sides and made rust colored spots on the bottom of my battery box. I cleaned up those spots and dried the tops of the batteries and we went on our trip. No water was needed.

While camping I checked the batteries again and found wetness. Dried it up and turned off the converter for most of the trip and just ran off the batteries (which powered things fine for our week long trip) and just turned on the converter for a few hours at a time to keep the batteries charged up. That worked fine.

We got home and I didn't plug the camper in for a week or so and the batteries were still powering things fine - really have only used the lights. Last night I checked the batteries - the water level was fine and there was wetness on the tops and rusty spots on the bottom of the box again. So I cleaned everything up and plugged it in around 5 pm last night and by 8 there was a little bit of wetness around the front cell holes on the tops of both batteries (it could be that I didn't dry them up perfectly and I am now seeing wetness because of using my LED headlight which is really bright). The batteries did not feel warm to the touch and when I pushed them back into their box by pushing on the side of one there was a gurgling noise as the side pushed in a little.

I've got a remote display for the converter. Just before I unplugged last night the display said 13.7 volts which looks correct per the manual for normal mode and the green led on the converter is blinking fast (my manual says that means the battery has reached 90% of full charge)

This morning after 11 hours unplugged and zero load on the batteries the remote display says 12.96 and the green led on the converter is still blinking fast.

The batteries were new in 3/2009, the converter 11/2010. Before the new converter I had a Magnetek which I religiously turned off and on as needed to not over-boil the batteries or allow them to freeze.

Did I give enough information? :W

Anyway - what I'm hoping to get from you gurus is how to find out what is going on. Could both batteries be bad or is my converter not charging correctly? My other idea is that the water (acid) is spilling out from the top holes because of bad seals on the caps while bouncing over rough roads - possible? How should I go about tracking down the problem?
  • If I remember correctly, the explosive level for hydrogen gas and air is 4%. Not very high and is easily reached near the battery during charging.
  • Wipe up the moisture with a paper towel. Then put some baking soda on the wet towel. If it bubbles then the moisture is battery acid. If it does not bubble than it is most likely dew as previously mentioned.
  • Battery will off-gas hydrogen when charging - if the level is too high in the cells some moisture will come out too. The cells need to vent when charging or gas and pressure will build up. Remember hydrogen can burn and is explosive at higher concentrations.
  • RoyB's avatar
    RoyB
    Explorer II
    Maybe a check with a multimeter would put your mind at ease. About the only thing that will boil out battery fluids is having 13.6VDC or more coming from the converter/charger unit for a long period of time.

    Your smart mode PD4600 series converter should drop your battery voltage down to 13.2VDC when nothing is going on. It will jump between 13.2VDC and 13.6VDC when being used.

    When it needs to re-charge it will jump up to 14.4VDC for about two hours and then drop back to the 13.6VDC level.

    I suspect some condensation is forming on your batteries since you have NOT noticed the battery levels dropping.

    Something to watch however...

    I originally had two GP24 standard issue 85AH Interstate batteries when I first got my Trailer. It was equipped with an older single mode ELIXIR charger and it wasn't no time before I boiled out one of the batteries making it unusable.

    I then added two more standard issue 85AH Interstate batteries and replaced the converter/charger unit to a PD9260C and all has been well now for the past 5 years or so. I still check my fluid levels on a regular basis out of habit but always find them ok.

    Roy Ken
  • I find with our golf cart that is more of a 50%+ end of life indication. If it has been 20F outside for a month then you get a warm 60F rainy spell they may just be sweating.
  • We had a 1992 Award Classic 30. The battery-box and tray was the same as yours.

    The moisture seen may just be from dew in the morning. The box is vented to the outside and no insulation. The wires going to the battery box are way to small for today's 3-stage chargers. The original converter/charger was only capable of 3 amps charging. It could still be capable of overcharging the batteries.

    We upgraded ours to a 3-stage charger that plugged into the original converter box in 2000. The wiring should be upgraded to a correct gauge if you do that.

    We loved the trailer but traded one of our Dodge pickups and the trailer for our current MH in 2006.