I bought one of these last year, and I like it a lot:
https://www.batteriesplus.com/produc...ultra/slc10004
They make a less expensive 1.5A one, but both of these are very flexible: 6 and 12 volt; trickle or fast charge; gel, AGM, and standard battery charging; and clips or rings. I might suggest buying one better charger and just moving it over every month.
I use this for my trolling motor, tractor, golf cart, and jetski batteries.
An alternative was mentioned above in the Battery Tender, which you can get for $35 or so, but only maintains.
In either case, I think anything related to battery chargers is worth spending a couple bucks more on for a quality unit.
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