Sorry but it sounds like a load of cheap Chinese junk to me.
A valve regulated battery is a lead acid battery like the kind used in a car but it's sealed and a valve is used to vent the hydrogen gas if the pressure is too high. Providing the battery is treated properly, the valve should never have to open. There's also often a mechanism which combines the hydrogen gas with oxygen to form water which is returned to the electrolyte, in the higher quality batteries.