Other platforms' batteries and Ryobi 80V HP
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Ryobi 40V packs fit directly, one way (see note) reported
“4 brushless motors, (2) 80V 10Ah batteries, and (2) 40V 12Ah batteries” — espanol.ryobitools.com ↗, checked Oct 8, 2026. One way and model-specific: the 42 in (RYRM8021) and 54 in (RYRM8034) 80V HP zero-turns also run on 40V packs; the 30 in (RYRM8010) takes 80V packs only. 80V packs do not run 40V tools (no source says they do). Brand statement read from a search result, so 'reported' until the page is read directly.
Same brand, different battery
Ryobi also sells Ryobi 18V ONE+. We have no source saying its packs fit Ryobi 80V HP tools, so don't assume a shared brand means a shared battery.
The Ryobi 80V HP lineup
Ryobi 80V HP is Ryobi's cordless battery platform. PowerToolGrid lists 9 products in it: 2 batteries and 7 lawn mowers. Prices on file run from $699.00 to $899.00. Sold only at The Home Depot. It shares batteries, one way, with Ryobi 40V.