Question about Ert transmissions

[Jv117]

Hi, with all the work you've done on Ert devices have you seen if they include the meters own battery strength in the transmission they send? This probably is only a thing on water or gas meters and not electric meters. I have a esp8266 and a Flipper Zero that I believe can't pickup the frequency of most Erts. Do you have any suggestions on things to read and decrypt these transmissions? Thanks