Brian Gaff (Sofa) formulated on Monday :
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.

The battery is not customer swappable. The battery is a long life one
10 years and to save battery power it only reports to the electric meter every
10(?) minutes, rather than the every 10 seconds that the electric meter
reports to the indoor display.

I have no idea how the modern mechanism to record the flow works.