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
Ryobi - 36V MaxPower Brushless Trimmer - 46 cm Cutting - 1 x 5.0Ah Battery - 1 x Charger - RLM36X46H50PG : Amazon.co.uk: Garden