I'm using my 40v 4ah Ryobi battery to supply a 36v Mower. The mower starts and then stops right away. The connections and voltage works well. When I use 40v 2ah WORX
Battery For Ryobi 36V 40V 4.0Ah BPL3640D2 RLM36BL BPL3650D BPL3620D — Tavice USA
Ryobi 36V 4Ah Battery - Bunnings Australia
Ryobi 36V 4Ah Battery | Power Tools | Gumtree Australia Casey Area - Berwick | 1315536574