well lead acid is a general term that's used to refer to a few types of lead acid battery to be more consumer friendly since the public can't be counted upon to know if a Flooded lead acid battery is compatible with a gel lead acid battery and so on. AGM is another type of lead acid battery but it's chemistry and makeup is quite different resulting in different cell voltages and charge characteristics. Similar to how Lithium ion polymer batteries are different from Lithium Ion Iron Phosphate battery and so on in the Lithium ion world.
This is what happens when the marketing team over-rules the engineering team.
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