The winged creatures from the Stung Treng province, in nothern Cambodia, were stored in freezers in 2010.
The discovery of the similar virus has led to fresh hope a new study on the bats could lead to a better understanding of Covid, according to Sky News.
Researchers have been examining the species, sex, age and details of the bats as well as collecting oral and rectal swabs.
Dr Veasna Duong, head of virology at the Institut Pasteur du Cambodge, claimed the destruction of natural habitats could have brought on the pandemic.
The research team have made four trips in two years to try and understand the origin of the disease among bats.