The current version is IEC 60601-1:2005 Amendment 1:2012 + Corrigendum July 2014.
In the definitions "supply mains" has the note "This also includes battery systems..."
Section 7.3.3 covers Batteries, as does 7.9.2.4 (Electrical Power Source), and the whole section 15.4.3 (Batteries).
The annex even has a figure A.23 showing a battery!

We can therefore say battery operated equipment is entirely within the scope of IEC 60601-1.

The law in Canada is found here: https://laws-lois.justice.gc.ca/eng/regulations/SOR-98-282/index.html#docCont
Guidance can be found here: https://www.canada.ca/en/health-can...s-under-medical-devices-regulations.html