20 Litre 15-18L Power Back mounted Sprayer. The backpack sprayer is portable, quiet, easy to set up, use, charge, maintain and clean. Rechargeable battery-operated sprayers with components that are made of high-quality plastic. Powered by 12/v10ah battery A fully charged battery can give up to a full day of spraying. A battery can be fully recharged in 4 – 5 hours.