"According to Sky News Arabia; Mossad was able to Inject a Compound of Pentaerythritol Tetranitrate (PETN) into the Batteries of the New Encrypted Pagers that Hezbollah began using around February, before they even arrived in the Hands of Hezbollah Members, allowing them to Remotely Overheat and Detonate the Lithium Battery within the Device."
This wasn't something magical that turned the battery into an explosive, they allegedly injected an explosive compound into the battery which would be triggered by intentionally overheating the battery.
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.
I am extremely skeptical.
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.