Finally bought a battery hydrometer, need help with results

Update: looks like I hit the ceiling with this wall wart. Another 36 hours later the charging voltage is unchanged at 14.25V and SG is still 1.250. I guess this 300mA wart just doesn't have enough power to get the voltage any higher, even though unloaded it is about 18v.

So, moved on to another wart I found. On this one the label says output is 12VDC and 1A. I measured the unloaded voltage at 16. Connected it to the battery and within a few minutes the voltage was steady at 14.7. Now we may be getting somewhere!