No Maintenance Coach Barttery

The recommended charging voltage is different for AGM's but only by a tiny amount.. Few converters are that well regulated and in fact how hot it is makes a difference as well and few are compensated for temp.. So the difference is too small to matter.

The big difference is something called Acceptance.. Some AGM's can accept a re-charge (Bulk mode) that is very, very, very fast, as much as 10x what a Flooded wet can take... (Specifically Lifelines are like this). Others the recommended max is about the same as Flooded so again, for the most part no differnece.

OPTIMA (A special case of AGM) has less capacity per cubic foot Recommend against unless you are in "Rough Service" (IE: Wave Runner, 4-Runner)

I have found AGM's do not, as is often preached, last longer... In fact I do not see how a "Sealed" type (Valve Regulated) can outlast a properly maintained flooded wet.. But they are nice if you have access issues.

Yes, AGM is the only thing that is maintenance free.

But I will never buy another battery from Universal. Made in China. They do specify both 13.x float voltage and 14.x Absorption voltage, and my solar controller gives them precisely what they want.

The only little problem is that they somehow gone completely sour by sitting several months in storage before I installed solar. They self-discharged to 55-60% which is right at the allowed minimum - according to the manual - and developed a HUGE self-discharge current afterwards. This wasn't the agreement :). Manual didn't say anything about that. By "huge" I mean 3%C a day.

Hi,

Agm's are not all the same. Lifeline wants a BIG FAT charging amperage. Others may not want more than c/5 (mine).

Some folks have had good luck with a 13.6 volt charge rate with Universal Batteries

So the real answer is find a battery that mates well to your existing converter or find out how to set up an inverter/charger to the parameters the particular AGM needs.

So far, Sealed (slosh) battery is out, not good for deep cycling.
AGM, 1. it will do fine, 1. it will be damaged, but I'll try to find if the voltage can be lowered to ??

thank you for the info

AGM batteries do require a slightly lower charge voltage. Check your charger documentation to see if it is adjustable. If it is not, you would risk damaging the expensive AGM battery.

False

Sealed slosh battery is junk for cycling

AGM will do just fine