I have a 50 Ah AGM battery that I use rarely (lighting during power failures, off grid camping, etc) - I use it a few times/year.
To prolong the life of the battery, do I need to keep it on a float charger all the time, or is it sufficient to use a timer to turn on the charger for a few hours every month (week?) to top off the charge? The charger I'm using is designed for AGM batteries and is is able to supply a float charge indefinitely.
I'm diligent about minimizing vampire loads by using a hard power switch to turn off unused devices and appliances so would rather not keep the battery charger on 24x7 unless it will make a significant difference in the lifetime of the battery.