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AGM deep cycle batteries are a sealed-cell variety of lead acid batteries. AGM batteries (absorbed glass mat) are sealed because they don't require maintenance like watering - making them appropriate for intermittent off-grid solar use like backup power systems or vacation cabins, and opening them up for more mounting options for added convenience.
While AGM batteries are deep-cycle, their cycle life is shorter than gel cell batteries (the other sealed lead-acid battery format), they're also less expensive.