Interesting that it wasn't discovered by any bomb sniffing dog in Lebanon. They had thousands of devices. There must be at least a few bomb dogs in Lebanon right?
https://en.wikipedia.org/wiki/Detection_dog#Criticism
The law was reviewed in 2006 by the New South Wales Ombudsman, who handed down a critical report regarding the use of dogs for drug detection. The report stated that prohibited drugs were found in only 26% of searches following an indication by a drug sniffer dog. Of these, 84% were for small amounts of cannabis deemed for personal use.[27]: 29 Subsequent figures obtained from NSW Police in 2023 revealed that between 1 January 2013 and 30 June 2023, officers had conducted 94,535 personal searches (refers to both strip searches and less invasive frisk or "general" searches) resulting from drug detection dog indications, with only 25% resulting in illicit drugs being found.[28]Like if you packed C4 into an electric car battery, it would be a bomb, much the same way if you packed it into an ordinary empty box. Sure the battery adds some extra energy, but the explosive is the explosive, ya know.
High explosives rarely require only heat to detonate, and most can be quite literally set on fire by an open flame and burn without detonating. PETN is not terribly sensitive, and should require a detonator of some sort. What's more, that doesn't jive with the other claim that they added a daughterboard to the device.
I'm very skeptical of a report about a specific compound and method 4 hours after an attack - Its not enough time for analysis