AGMs & Maintainers
This topic is not RV related but there is more battery expertise here than anywhere else I know of. Mostly over my head :) I have this AGM battery in my Seadeoo. I used this maintainer on my wet ce...
Forum Discussion
The difference between an AGM of that size and a FLA battery maintained is that an AGM likes to gulp a lot of current to perform well and the FLA will sip until it's full. That's why your battery maintainer delivers the low current and maintains that low current when powered and connected. Your AGM will survive better if fed even small sipping rather than sitting idle and no electrons served. It will lose little voltage while in storage so intervals between use becomes important. The small charge delivered by the engine is enough to maintain sufficient power and charge just a small bit. It is dumber than a battery charger.
FWIW, I maintain a few disconnected batteries, both AGM and FLA. I use these 12V batteries for emergency pumping duties, vehicle replacements, and any other use I find around the house. I have multiple chargers and 12V power supplies available. What works for me best is to use a reclaimed 12V wall wart. Unloaded it outputs 16VDC at a maximum of 3 amps. I connect it to a battery and watch voltage rise. After three of four days voltage will rise to 14V. At that point, I disconnect it. The battery is fully charged and is left to discharge until I get to it in a few monthes. My method is not perfect because i don't continually float but I have good luck with longevity. I have one Diehard that is 15 yrs old.
FWIW, I maintain a few disconnected batteries, both AGM and FLA. I use these 12V batteries for emergency pumping duties, vehicle replacements, and any other use I find around the house. I have multiple chargers and 12V power supplies available. What works for me best is to use a reclaimed 12V wall wart. Unloaded it outputs 16VDC at a maximum of 3 amps. I connect it to a battery and watch voltage rise. After three of four days voltage will rise to 14V. At that point, I disconnect it. The battery is fully charged and is left to discharge until I get to it in a few monthes. My method is not perfect because i don't continually float but I have good luck with longevity. I have one Diehard that is 15 yrs old.
