A batch feed garbage disposer operates very similarly as a continuous feed except there is no switch to operate it. Instead the disposer is switched on by placing the drain plug in place and turning it. You start by placing suitable kitchen waste into the disposer, turn on the cold water and install and turn the drain plug. When it has finished grinding, you stop the disposer by turning the drain plug the other way.
The chief advantage with the batch feed disposer is safety. It cannot operate without the drain plug, and so it will not operate while reaching into the drain, nor can items fall into the disposer while it is operating.
The chief disadvantage is the ability to place only a small amount of waste into the disposer at a time. It must be repeatedly loaded and operated if you have even of a moderate amount of kitchen waste. Another disadvantage is that since it will not operate without the manufacturer's drain cover, it cannot be operated if your drain cover is lost or damaged.
Because the batch feed model is less common, it may be slightly more difficult to find one in the the desired configuration. Although all of the major manufacturers offer one or more batch feed disposers. Also, batch feed models are typically only available in higher end models. If you are shopping for an inexpensive model, you may not be able to find a suitable one with the batch feed feature.