Tips Due to long-term transportation, the pump is filled with air, the machine may be blocked with air.please use squeeze ball inject a small amount of water into the interface start the machine at same time to remove the excess air. Then install the hose. The power of the battery power washer can not be comparable to a high-electric power washer machine, but it is portable and easy to use, before purchase make sure it fits your purpose. 1.charge the battery first 2. Use the squeeze ball to fill the machine with water, start the machine and remove the air. 3