Plus you can do the cert test and remove the battery during cold soak, only refitting just before you power up. But this should be SOP for all airlines if certified this way.
It is SOP on present day aircraft (A320/B737).
They all have procedures for parking in cold weather, and at Minus 20 or so that includes battery removal to a warm office.
It catches us out once in a while. We always put a hot air heater on the aircraft, and leave the batteries in and the outflow valves open. Then a pilot will read the FCOM and do something off his own bat.
It is amazing how much force there is with a heater hose connected, and the ditching button pressed on an A320, and you open the pax door. The FO caught the Capt as he flew across the jetty!