Buy a Makita Lithium Ion kit from Bunnings and get a bonus battery
You can claim the battery via redemption from Makita on the deep linked page. The promo runs until 31st March with the final date for redemption claims 12th of April.
To be eligible you need to buy a Makita Lithium Ion 'kit' from Bunnings. Kit is defined as being any Makita gear that comes with a charger (model numbers DC18RA, DC18RC, DC18SD or DC18WA) and at least one Li-Ion battery (model numbers BL1830, BL1815 or BL1811G).
To claim you need a copy of your invoice, store name and purchase date.