Really not a good idea to mix AGM batteries and wet-cell batteries together. However, it is better than mixing either with Gel cells, which IMHO are more sensitive to improper charging and more easily damaged than either wet cells or AGMs.
You should have gotten two AGM batteries. That is often the best solution, especially if you have a fairly limited charging time frame. AGM batteries have the highest charge acceptance rate of any battery commonly used on boats. That means you can charge it to the 80% level faster than you could with wet-cells or gel batteries. The float charging, which you need to do after hitting the 80% bulk charge point, still takes about the same amount of time with either.
While some of the high-end chargers can handle different chemistry batteries, as they can be set to charge separate banks in different ways, however, it is generally not a good idea to mix chemistries, since the alternator and other less advanced charging sources will still cause some problems.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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