Each filling will take between 50 to 100 milligrams of material (depending on the herb, appx. 1/4 of a teaspoon).
We recommend that you add ground, unpacked material until it is level with the groove (but do not fill the chamber), even if this may be more than you would normally need. Because the Box is able to heat up nearly instantly (no waiting), it is convenient to use. Because the Box is also able to cool off again nearly instantly, it does not waste any material either. The Box only requires battery power when you are actually drawing on it.
Instant on and instant off heating means you can control exactly when doses are delivered with the Box. Vapor is dispensed only when you want it -- which means no wasted vapors (more efficient). By removing the battery when you are done taking a draw, the rest of the un-vaped material can simply wait to be cooked later (even hours later). When not in use, the Box simply stores your loaded material unchanged. This is very different than most other vape units which must cook the entire load to completion once they have been started.
By filling to level, you will be getting more overall vapor per charged battery. Each charged battery will provide the same heating in the Box whether it is fully loaded or empty. Therefore, any part of the unit which is hot but not loaded wastes heat and battery charge. You may as well load it fully and get the full benefit of the battery energy. Also, under filling the Box can result in lower vapor density (the ratio of vapor to air).
If you wish to vape more than 200 milligrams of material per day, you will probably need additional NiMh batteries (which we can supply, or you can purchase along with a charger in most electronics stores). A good fast charger tends to cost between $15 and $35 and usually comes with the right batteries. See our FAQ on batteries and chargers for more info. Another option is to purchase the Desktop Power Adapter accessory for the Launch Box.