I contacted Deltran and asked which Battery Tender I should use for a absorbed glass mat (AGM) battery that is in our cars. They told me to use their Battery Tender Plus Gel unit.
I use it religiously as my car is driven sporadically. And still, my battery died and had to be replaced at 10 months, 7100 miles.
2012 BMW 535I 23,000 Miles
ED Pick Up on 12/03/2011; US Pick Up on 01/27/1012
Alpine White, M Sport, Blk Nappa, Cold Weather, Luxury Seating, Premium, Premium Sound, Tech, Sports Trans, Active Cruise, Heads-Up
Mods - Quad Exhaust Tips, HID Fog Lights, Clear Front Reflectors, M5 Spoiler, Calipers Painted Black, 12.5 mm Rear Wheel Spacers, Tint - 5% Rear, 35% Front & 50% Windshield - BlackVue DR500GW Dash Cam, Blendmount for Valentine One
Coding by tuesday (aka; itschase) (Chase)