Originally Posted by Quahog
The only difference I see is that the ones I got were Energizer vs. Duracell. They were around $78 each plus fees.
x3 Energizer Sam's spec GC2's going on our third season and will provide many hours of draw down time between charges. I usually run a fridge, lights, 700 W inverter to power the TV's at night and never get lower than 60% over a full 24 hour cycle. These are taller and weigh considerably more than a 12V deep cycle.
Once hooked in series (positive to negative) they create one 12V battery which your charger will charge the same as your single 12V battery currently installed.
One side note is that I have had these on a 3 stage smart charger their entire life between 2 trailers which will extend the life of any battery you have installed vs the older 2 stage systems which is something to consider before you invest.