Platforms it's compared with
We have no source saying any of these share batteries with Kobalt 40V, so owning both means two sets of packs and chargers. Each comparison lines the two platforms up tool by tool.
Same brand, different battery
Kobalt also sells Kobalt 24V MAX and Kobalt 80V. We have no source saying their packs fit Kobalt 40V tools, so don't assume a shared brand means a shared battery.
The Kobalt 40V lineup
Kobalt 40V is Kobalt's cordless battery platform. PowerToolGrid lists 15 products in it: 7 batteries, 3 lawn mowers, 1 trimmer, 3 leaf blowers and more. Sold only at Lowe's.