EGO 56V Lawn Mower with 2×10Ah Batteries & Bonus 5Ah Battery via Redemption $1599 + Delivery ($0 QLD In-Store) @ TradeTools

This powerful EGO 56V 10Ah 50cm (19″) Brushless Cordless Steel Deck Self-Propelled Lawn Mower Kit – LM2026E-SP-2 comes with two 10Ah batteries and can redeem a 5Ah battery from here: https://egopowerplus.com.au/redemption
Potentially can price match in some stores.