AGMs are lead acid batteries too, but they are different than the more common FLA (flooded lead acid) in that they are maintenance free and don't like overcharging (which is something you should periodically due to FLAs to equalize them). They both recharge at roughly the same rate, but AGMs can be left in a partially discharged state for a long time without the sulphation issues seen in FLA batteries. This feature is irrelevant if you are putting the battery on a charger overnight or longer after every use.
Don't discharge your lead acid battery below 50% capacity, it will damage it and reduce the lifespan of the battery. Thus, if you calculate that you need 100 AH of battery capacity, buy 200 AH of battery and consider 50% depth of discharge "empty".
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