Having used all the sprayers, I think Birchmire makes a great battery backpack sprayer, but for half the price, this one is a fantastic option. I love the variety of spray tips included.
Product Information
Smith Multi-Use 18V Lithium-Ion Powered Backpack Sprayer (190576)
The Multi-Use 18V Lithium-Ion Powered Backpack Sprayer will allow up to 4 hours of spray duration or 50 gallons of liquid. It provides a consistent chemical spray output that ensures optimal application rates saving time and reducing chemical waste. Included with this sprayer are six nozzles for a wide range of applications: Brass Adjustable, Low, High and Max volume fans, jet stream and foaming (spot treatment) nozzles. It has viton seals, heavy-duty kink resistant hose, a stainless steel wand, and powder coated steel frame for chemical resistance and durability.
Specs
Tank Capacity: 4 Gallons
Extension: 21" Stainless Steel
Charger: 3.5-hour charger included.
Hose Length: 50" Nylon Reinforced
Nozzles: Six nozzles included for a wide range of liquid application: Brass Adjustable, Low, High and Max volume fans, jet stream and foaming (spot treatment) nozzles.