Same brand, different battery
Kobalt also sells Kobalt 40V and Kobalt 80V. We have no source saying their packs fit Kobalt 24V MAX tools, so don't assume a shared brand means a shared battery.
The Kobalt 24V MAX lineup
Kobalt 24V MAX is Kobalt's cordless battery platform. PowerToolGrid lists 13 products in it: 5 batteries, 2 string trimmers, 1 blower, 1 hedge trimmer and more. Sold only at Lowe's.