# Which batteries work with Ryobi 40V?

> Ryobi 40V shares batteries with Ryobi 80V HP, in one direction only. The note on each link says which way it works and names its source.

- **Ryobi 80V HP** — pack fits directly, one way. Confidence: reported. Source says: "4 brushless motors, (2) 80V 10Ah batteries, and (2) 40V 12Ah batteries" [Source](https://espanol.ryobitools.com/products/details/46396040923), checked 2026-10-08. 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.

## Exceptions inside the platform

- 6.0Ah 40V pack with some lawn mowers whose battery bay is too small: does not fit. [Source](https://www.walmart.com/ip/2683942374) (retailer), read 2026-10-08.

- Line: [Ryobi 40V](https://powertoolgrid.com/lines/ryobi-40v/)
- Every sourced battery fit: https://powertoolgrid.com/battery-swap/
- Page: https://powertoolgrid.com/battery-swap/ryobi-40v/

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"Confirmed" = the brand's own page says it; "reported" = a source says it, seen through search or a store page; "inferred" = worked out from evidence nobody states outright. PowerToolGrid does not list a fit it cannot source. [How we compare](https://powertoolgrid.com/how-we-compare/).