Okay so NZ does not get this cold, but it seems they do not like the cold.
Note also that Sweden is still waiting for the global warming.
BTW, EV (cars) probably do not like the cold either.
No question about that - there is no such thing as a battery that performs in the cold to the same standard as at normal temperatures. Most children know that.
Batteries that are used at the poles etc. are usually kept warm.