A battery mounting apparatus requiring a minimum of screw fixings includes an enclosure, two positioning members, and a supporting mechanism. The enclosure includes a rear wall defining two ventilation openings. A separated board is formed between the two ventilation openings. Each of the two positioning members includes a first latching portion and a first clipping thumb extending from the first latching portion. The first latching portion of each positioning member is engaged with a first edge of the two ventilation openings, in two opposite directions. The supporting mechanism securing a battery module is secured to the two positioning members, preventing the two positioning members from moving parallel to the rear wall, and the battery module is secured to the enclosure via the two latching members and by the supporting mechanism other than with screws.