I am contemplating a battery maintenance device to leave attached when my car is in the garage.
I think I want somethign which will hold voltage at 13.2 volts or thereabouts, some seem to maintain 14.4v, which is ok for a top-up charge but seems to be too high to maintain in the long term.
I plan to work through a few articles/FAQs on batteries and see what products best match the recommended advice.
These seem like a good start :