Camp Kamp

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House batteries

Getting ready to go dry camping this weekend and my house batteries are not keeping 100% charge. I bought 2 interstate deepcell 06/2010 I thought I should get 4-6 years out of them but am told maybe 3 years.. So I guess my question is every 2-3 years I should replace my house batteries? my old cheap ones that came with the rv were 5 years old..