ATP-dependent low-affinity peptide transporter which translocates a broad spectrum of peptides from the cytosol to the lysosomal lumen for degradation (PubMed:15863492, PubMed:17977821, PubMed:18434309, PubMed:22641697, PubMed:25646430, PubMed:30353140, PubMed:30877195, PubMed:31417173). Displays a broad peptide length specificity from 6-mer up to at least 59-mer peptides with an optimum of 23-mers (PubMed:15863492, PubMed:25646430). Binds and transports smaller and larger peptides with the same affinity (PubMed:31417173). Favors positively charged, aromatic or hydrophobic residues in the N- and C-terminal positions whereas negatively charged residues as well as asparagine and methionine are not favored (PubMed:15863492, PubMed:17977821, PubMed:18434309). {ECO:0000269|PubMed:15863492, ECO:0000269|PubMed:17977821, ECO:0000269|PubMed:18434309, ECO:0000269|PubMed:22641697, ECO:0000269|PubMed:25646430, ECO:0000269|PubMed:30353140, ECO:0000269|PubMed:30877195, ECO:0000269|PubMed:31417173}. This is the function of ABCB9 (ATP binding cassette subfamily B member 9, ENSG00000150967).