Does this amazon review make sense? I think this is what I'm looking for just not what this fella was looking for. I want the battery to charge then when it gets low top off. I'll probably just plug it in manually in the winter if needed. I ride enough most of the year.
The following is an Amazon review for a charger maintainer
"First , I'am an electronic design engineer and have dealt with most types of batteries in my design projects. I also use and buy charging equipment fairly regularly. I have this 2013 ford Taurus which I recently found out has an above normal parasitic battery draw which is intermittent, but will bring a fully charged battery down to 12.2 volts in 2 days and discharge below starting voltage in 5 days of sitting. I always fix my own electrical problems, but the difficulty of tracking this down versus just plugging in a standy charger , forced my to decide on the charger option. So I get this B&D BM3B and it seems like it should work. But in my testing, I found that the charger would repeatedly charge to a voltage of 14.9 volts , then cycle down to 13.8. I reasoned that this was becatuse the phantom load of my car was discharging the battery enough to send the B&D into the absorption stage. Since I did not want the battery to be cycled , I decided to use a constant float charger for the car. Then I thought I would use it to maintain a pair of golf cart batteries over the winter. To test I put this charger on and monitor the current and voltage. Again after the the charger charged up to 14.9 volts , the current decreased until the voltage dropped to 13.8. I expected the charger to stay at 13.8 float voltage until the battery self discharge ( in a month or so ) dropped the voltage, but no , in a short period of time it just repeated the full charge cycle even though it was not needed. I'am shure that over the long run this behavior would be detrimental to the batteries. This charger would be ok for occasional use, but not to maintain batteries over an extended period."