Discharging a LA or SLA will probably damage it.
Ive worked with Exide on high capacity batteries and on the particular battery, PERMANENT damage ocurrs below 10.5 VDC
Agreed, too vague.
Consult the battery manufacturer, not other sources, for advice, its their battery.
"Strength does not come from physical capacity. It comes from indomitable will." -- Mahatma Gandhi