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I am not blaming the Harris batteries entirely for the failure after two years and four months. At least twice I left the storage/run switch on run while not charging for a long enough time that the batteries were down to about five volts. Also I was negligent in checking the cells for electrolyte and had to add a lot of water more than once. Then this week I opened the compartment and found that the batteries were boiling and very hot. Three cells on two batteries appeared to be dry. After filling them with distilled water and leaving the RV on shore power over night, the batteries were boiling and there was a strong sulfur smell. After removing the batteries I measured the voltage at 10.4 and 12.4 volts (one failed and the other was probably damaged by the failed battery). The new batteries are maintenance free and have knurled brass posts instead of lead posts. So I had to use battery adapter sets.
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