Spare batteries and power banks - Qantas

What the official page says

You can carry up to two power banks per person, each not exceeding 160Wh. Power banks cannot be used or charged during the flight, including via in-seat USB ports. Power banks and spare batteries must be packed in your carry-on, not your checked baggage. No more than 20 spare batteries in total, for personal use, are permitted per passenger. All other battery restrictions still apply e.g. no more than two spare lithium batteries exceeding 100Wh and up to 160Wh, are permitted and forms part of the total carried. Lithium-ion battery (rechargeable) - not exceeding 100Wh: Airline approval required - No. Lithium-ion battery (rechargeable) - exceeding 100Wh and up to 160Wh: Airline approval required - Yes. Only two spares per passenger. Lithium-ion batteries over 160Wh are forbidden as passenger baggage and must be sent as freight.