Same brand, different battery
Kobalt also sells Kobalt 24V MAX and Kobalt 40V. We have no source saying their packs fit Kobalt 80V tools, so don't assume a shared brand means a shared battery.
The Kobalt 80V lineup
Kobalt 80V is Kobalt's cordless battery platform. PowerToolGrid lists 19 products in it: 6 batteries, 3 lawn mowers, 2 string trimmers, 3 leaf blowers and more. Sold only at Lowe's.