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the voltage will almost always drop a bit when your pulling a load from it. 12.8 volts at a rest.. if its being charged you will see more.. most charge controllers put 12.8 -16 volts into the battery depending on depth od discharge. as the battery gets fuller the voltage and amperage put in gets...

"Standby" use – using batteries as backup power: Batteries used in standby applications are predominately used to supply emergency power, helping prevent any damage that may be caused by sudden loss of mains power. For standby power applications, so-called stationary or standby batteries are...

AGM = absorbed glass mat.... the sulfuric solution is absorbed into a glass mat separating the plates. most of the time even if you tip it over very little solution will spill.... *edit* my AGMs wont spill. but I looked online and it seems some cheaper AGMs are considered a wet type battery...

you cant check AGM's with a hydrometer

link to the blog?