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It might be me but I have had very bad luck with Interstate batteries. In both my original Interstates individual cells went bad when they dischacharged too much.
However I always do the following:
1 I check each individual cell with a hydrometer that you can get at Walmart for a buck or so. Keep cells full.
2. When connected to shore power the charger should put out about 13.5 volts to the battery. Cheap voltmeters are available most anywhere.
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