Brian Gaff wrote:

Which brings up the whole idea, how does a gas meter work? I have no gas,
but am intrigued as many people with smart meters are told to change a
battery in the gas bit. One assumes then that it the gas is coming in at a
different place to the electricity, and there is no mains connection it
talks to the other mete using battery power, sounds a bit crude.

smart gas meters have a D-Cell Lithium Thionyl Chloride cell, 15 year
shelf life, 3.6 volt, 19 amp hour, that's why gas meter sends readings
to in-home display much less frequently than elec meter