Or why some owners are paying a premium for lithium batteries which generally charge faster. And even lithium batteries are not the same since some use different chemistry. The most common for RV are safest but charge slower compared to automobile-type lithium batteries, which a few RVs are using. Regardless, even lithium iron phosphate charge fairly fast, so if only partially discharge, an hour or less “may” do.
AGM lead-based batteries apparently don’t do well with partial charging, and take longer to completely charge, so that’s one disadvantage when using a generator to charge them during the day.
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