I won one in a draw from Norbain a few years ago, the quick crimp type that push through cores gets cut off when crimped. I prefer it to my ordinary one.
I also bought a cheap one on Temu because I didn't believe it would be any good but its fine, think I paid £7 for it .
You are not reading what he typed correctly he typed "with the panel and sensors pulling 0.55 A"
Now there was no mention of mA so 0.55A no matter how you try to dress that up is slightly over half an amp.
He may have made a mistake but either way what he typed is 0.55A not 0.055A which would be 55mA
Two things of note here, if your panel is pulling over half an amp quiescent that seems quite high to me and also if your new battery is dropping to 12v under load I would suggest its not a good battery.
Most likely because you are activating the devices just before or during the setting procedure. Wireless devices will go to sleep for a short period after activation to conserve battery life. If you try triggering a device that has not activated recently you should find the system will respond almost immediately.
The Testifire one issued to me at G4S was £1400.
The fire guy at has one apart at the moment, he seems to know what he's doing, if theres anything I can ask him for you Pete?