Don't use a traditional wet battery, get an Optima AGM type - no electrolyte to boil out. The Yusa float chargers I use have never overcharged any batteries but I do take a look every so often.
Some battery tenders are not capable of maintaining an AGM battery. If you do use an AGM battery, make sure to get a charger/tender that has a setting for AGM-type.
Lives in garage:
2004 Red Jeep TJ "X", big tires, suspension, stereo delete, dent in cowl.
1982 Red Jeep Scrambler, small block chevy on 35's.
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." -Benjamin Franklin