Ryobi 36V/40V Battery Adapters
Ryobi's 36V/40V is the outdoor line — mowers, trimmers, blowers and chainsaws — where the pack is a large share of what you paid and most people own exactly one. It sits alongside 18V ONE+ rather than replacing it.
3 adapters here, running both ways: a 36V/40V pack driving another brand's tool, or another brand's battery running a 36V/40V one. Worth knowing before you order — 36V/40V is a separate system from Ryobi's own 18V ONE+, and the two do not interchange however alike the packs look. The adapter you need is chosen by platform, not by brand. Pick a direction below, or use the finder if you know both ends of the pairing.
Pick a tool to run from your Ryobi 36V/40V battery
Ryobi 36V/40V questions
Is a Ryobi 36V/40V battery 40V or 36V?
Both — it is one battery described two ways. 40V is what it measures fresh off the charger with nothing drawing from it; 36V is what it settles at under load, and that is the figure most other brands print on the tool. So a 40V battery and an 36V tool are the same class of battery, which is exactly why an adapter between them works.
Will this fit my other Ryobi batteries?
Only Ryobi 36V/40V batteries. Ryobi also sells Ryobi 18V ONE+, and those use a different socket — same brand, different rail and terminals, so they need their own adapter. Compare the sliding rail on your battery against the photos before ordering.
How do I find the right adapter on this page?
Use the selector at the top: pick the platform on the other side of the pair and it takes you straight to the one adapter that joins them. Every combination in that list is one we actually make, so if it is there, it exists.
Can I go the other way round — run Ryobi 36V/40V tools from another brand’s battery?
Yes. Use the swap button next to the selector above and the page turns the search around, from Ryobi 36V/40V tools back to the batteries that can run them.
Can I charge a Ryobi 36V/40V battery through the adapter?
No. The adapter carries current from the battery to the tool and does nothing else — there is no charging circuit inside it. Keep charging Ryobi 36V/40V batteries on their usual Ryobi charger.
Will an adapter damage my Ryobi 36V/40V battery or my tool?
Used with undamaged, compatible equipment it is not expected to. Ryobi 36V/40V batteries are lithium-ion with their own protection circuit built into the battery, and it keeps doing its job through the adapter. Stop when the tool noticeably slows rather than running the battery flat, and stop using the adapter if it becomes unusually hot or the contacts look damaged.
Does it work with third-party Ryobi batteries?
Usually. What matters is the socket, not the badge: if the battery slides onto a Ryobi 36V/40V tool and locks the way an original does, the adapter will take it. Aftermarket batteries do vary in moulding, so if yours looks unusual send us a photo and we will check before you order.