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I had two interstate batteries in my MH which failed after two years use. My fault not the batteries. I left them in place in year two when storing but forgot to disconnect. When I checked the draw on the new batteries I found that the sensors etc drew about .3 amps. Thats enough to drain two 100 amp/hr batteries in less than a month.
I switched to AGM batteries. I fully charge them for storage and bring them back up about mid-way through storage (3 months). I don't use a trickle charger. I have a charger that goes into float mode, which reduces the voltage below the maximum of the battery. I use it now permanently attached to two batteries I use for emergency power for my propane fireplace in the event of a power failure during the winter. The worst one so far was 4 days.
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