Originally Posted by mickrock
How much better, if any, is an agm battery?
Interesting question. According to my research, for a battery installed in a box on the tongue, you would be paying significantly more for not a lot extra.
AGM battery's main benefits are
- being able to be put in a living space because they are sealed.
- no adding water because they are sealed.
- can tolerate higher charge rates than flooded (standard) batteries. This would only matter if you were recharging with a generator, and had a converter that was optimized to recharge AGM batteries.
- AGM batteries can handle occasional deeper discharges (30-40% or so vs 50% for flooded) with no loss of life.
In my case, the benefits are not worth the extra cost. I bought my dual 6V golf cart batteries for $150 (for both, tax included) at Costco. They are mounted on the tongue, along with a disconnect. I do have to check the water level occasionally, especially since my converter will not go into trickle mode.
We do not have a generator or solar. The batteries are expected to carry the A-frame dry camping for 4 cold nights (30 degree) in Colorado. Then they need to be recharged.
2014 Rockwood A122 A-frame
2008 Hyundai Entourage minivan
camping Colorado and adjacent states one weekend at a time