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AGM don't have water to boil away from being at 14.5 volts for long periods of time. I don't think they would really like being held at 14.5 for too long though. Starter batteries are made for high discharge for a brief time, and to then be topped up and only run(or charged) for a limited period of time. Deep cycle batteries for power supplies and stand-by power get charged to 14.5 for an hour or four and then throttled back to 13.6, which they can sit at indefinitely with just an occasional top up of water. If they get charged at 14.5 they get hot, and also bubble a lot, and use a lot of water, and are probably damaging the plates. Bubbling is physically hard on the plates. Modern smart chargers these days though, and especially those maintenance type chargers, will all most certainly throttle the voltage off to about 13.6 after an hour or two of 14.5. Trojan batteries has a lot of interesting reading about batteries and their maintenance and performance and all sorts of stuff. .

Never heard that but maybe AGM reacts differently to being maintained daily. I know they dont like to be charged with high amperage or quickly.

The recommended rate of charge for a lead acid battery is amps at ten to twenty percent of the amp-hour rating of the battery. I'm not sure what the rate is for AGM but it's probably at the lower end of those figures. Once a battery is charged, even a car size battery, then two amps is plenty of amps. Two amps is what a car battery will take to keep it's voltage up to 14.5 volts. Two amps is quite a lot for a maintenance charge and would likely make it use water. A good battery shouldn't loose more than ten percent of it's charge in a month, which is so little that it doesn't harm or take life cycles out of the battery's life. A battery life has a certain number of discharge cycles, but they only consider it a cycle if the battery gets below eighty percent of it's capacity. You P5200 could just connect your charger once a month for between four and eight hours and it will be plenty enough to keep the battery fully charged. Two to four hours will probably be enough even.

T for top and F for firing.

I keep 1 or 2 amp maintainers on all my batteries that aren't used regularly . One is on my quad, one on my riding mower, one on a jump stater / air compressor pack and one on my 3/4 tom 4x4. They're far cheaper than replacing batteries that have lost capacity or completely failed because they sulphated up from self discharge while the machines sat idle for extended periods. A battery kept charged up on a maintainer can last several years while one allowed to sit at less than full charge may fail within a year or two.

👍 I use maintenance chargers 2 amp for my smaller batterys in motorcycles and ATV, i also use them on my cars for the ones i dont use that often, but if you are charging a dead car battery i use a 6 amp, dont really like to chaarg with anything stronger than that its not good for the battery. If you are really in a hurry with a car battery i crank it with a jumper pack and let it run for a while and charge with the cars alternator.