Backpack sprayer

A backpack fluid dispenser comprising:

• a housing comprising a bottom face and defining:
• a fluid container;
• a battery compartment for receiving a battery;
• and
• a chamber for receiving a control assembly and a pump assembly, wherein the control assembly comprises a rotatable dial, wherein the rotatable dial comprises a cam surface engaged by a follower for controlling on and off of the pump assembly;
• and
• a dispensing assembly for dispensing fluid from the fluid container,
• wherein:
• the pump assembly is configured to pump the fluid from the fluid container to the dispensing assembly;
• the control assembly is configured to control the pump assembly;
• the battery compartment is positioned above the bottom face with a first height therebetween;
• the control assembly is positioned above the bottom face with a second height therebetween;
• the cam surface comprises at least a first surface having a first radius and a second surface having a second radius different from the first radius;
• the follower moves to a first position when engaging the first surface and opens a switch of the pump assembly;
• and
• the follower moves to a second position when engaging the second surface and closes the switch of the pump assembly.

A backpack fluid dispenser comprising:

• a housing, wherein the housing comprising a bottom face and defining:
• a fluid container spaced apart from the bottom face;
• a battery compartment for receiving a battery;
• a chamber for receiving a control assembly and a pump assembly;
• and
• one or more drain holes disposed in the bottom face to drain leaked liquid before the leaked liquid accumulates to enter the battery compartment;
• and
• a dispensing assembly for dispensing fluid from the fluid container,
• wherein:
• the pump assembly is configured to pump the fluid from the fluid container to the dispensing assembly;
• the control assembly is configured to control the pump assembly;
• the battery compartment is positioned above the bottom face with a first height therebetween;
• and
• the control assembly is positioned above the bottom face with a second height therebetween.