Aus: No batteries at all in the hold
Chuck Norris:
The Australian Civil Aviation Authority recently promulgated a rule banning all batteries, of ANY capacity and ANY chemistry, including Primary (non-rechargeable) batteries from hold baggage.
All batteries must be in carry-on luggage, either in their device or packed in an insulating container (paper envelope will do).
So in Australia, the answer is "Everyone's airline has banned them."
Cheers