Very Inexpensive Battery Maintenance Charger
1.0 ampere output. 13.8 volts regulated charge limit. This unit is good for 100 amp hours worth of batteries. IMO the voltage is a tad high for a high antimony RV battery with temps 60F or higher but ...
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I found my notes. I bought this one, shown below. After several hours on a fully charged battery, it was hitting 13.9 volts at 0.25A. IIRC it was still going up. I worried that the voltage was too high for float. So I returned it.
