Mechanos
Veteran Member
Check out Deka Intimidator AGM batteries.
I have seven of the battery tender Jr's and so far all are working great.
After the battery is fully charged I use this one, which Northern Tool must not stock any longer:
Product: BatteryMINDer Charger/Maintainer/Desulfator 1.3 Amp, 12 Volt, Model# 12117