Predicted to enable proton transmembrane transporter activity. Predicted to be involved in several processes, including cation homeostasis; sensory perception of sound; and vacuolar proton-transporting V-type ATPase complex assembly. Predicted to act upstream of or within several processes, including inorganic ion homeostasis; renal sodium ion transport; and renal water homeostasis. Located in apical plasma membrane; basolateral plasma membrane; and synaptic vesicle. Is extrinsic component of synaptic vesicle membrane. Human ortholog(s) of this gene implicated in renal tubular acidosis. Orthologous to human ATP6V1B1 (ATPase H+ transporting V1 subunit B1). [provided by Alliance of Genome Resources, Apr 2022]