Not all varieties of weed sprayer require a battery to function. Of the several different kinds, a large number of sprayers are attached to a garden hose or use pump-action compression to work.
Battery-operated weed sprayers generally have a larger tank capacity and have tanks made from galvanized or stainless steel. As a heavier unit, these are often carried with a shoulder strap. Large-capacity compression sprayers, or backpack sprayers, are also available, often fitted with a lever-style pump so that the unit can be operated without needing to remove it first. Some battery-operated units are available with rechargeable battery packs for convenience.