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Absorbed glass mat batteries are still lead acid batteries, they do however have a glass mat that holds the acid and keep the lead plates separated so they can be thiner and closer together, they tend to be less forgiving in over charging and discharging as the plates are thiner and the sealed design incorporates pressure release valves that vent the hydrogen and oxygen as it's produced from over charging, with AGM batteries there is no way to replenish that once it's gone, with my T105 golf cart batteries in my electric car I just open the caps and add more distilled water, something that with heavily used batteries happens about once per month, on a lightly used battery like sits under the hood of a gas car you might add water every 5 years, or replace the battery altogether every 5 years.
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