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Old 08-26-2015, 12:12 PM   #1
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Join Date: May 2012
Posts: 148
Battery leaking out the top

I have two 6 v batteries. One of the batteries is showing signs of leaking out the caps, making a mess. This is when parked at home. I have a automatic float charger charger on all the time. The charger is from Harbor Freight. Maybe not the right choice. I don't have the coach hooked up to shore power just the small F H charger. Should I just use the coach charger and forget about the Harbor Freight charger? Then it may be the battery cap system. It has the caps arranged so all caps are removed at one time. Stan

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Old 08-26-2015, 12:34 PM   #2
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You should unplug it and remove the caps after a few minutes and check the levels in the batteries. Fill up with distilled water if needed and then plug in using your trailer converter to charge the batteries.
The Harbor freight charger may be overcharging. Can you check the voltage of it while charging the battery with a multimeter?

If your trailer is newish (last 5 years??) then it likely has a 3 stage charger and won't overcharge your batteries.

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Old 08-26-2015, 12:46 PM   #3
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stans02, you don't show age of your rig and batteries. is it possible batts are bad and boiling over?

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Old 08-26-2015, 02:05 PM   #4
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I use one of the HF chargers too. I have measured it MANY times, and I continue to measure it often (I was always taught "Trust, but verify" and my trust in cheap tools is thin). It has always put out a nice float level of 13.2V. Though I smelled something funny in the garage this morning leaving for work, so I'll have to check up on that battery.

That being said, if I were able to plug my trailer in while in storage, I would just depend on the built-in charger to maintain the battery, as I have verified that it is in fact a multi-stage charger, and have also verified its voltage output at all stages.

If your trailer is older and does not have a multi-stage charger, I would not leave the battery plugged into it.

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Old 08-27-2015, 06:32 PM   #5
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Sounds like the charger is boiling the batteries dry, check out BAttery Minder, a bit more $$ than HF stuff, but good quality, I use 'em alot on the RV and boat to keep things charged up.
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