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Notes -
If I had to hide an electronically ignited bomb in a battery, I would try to set it up so that a short ignites a primer which will ignite the explosive. Fill an electrical fuse with a primer which is volatile enough that the molten wire sets it off, perhaps?
The alternatives being that you have three leads on your battery (e.g. +, -, boom, where connecting boom with + will cause the explosion.), which is much more noticeable, or having another component which serves as a primer on the PCB near that battery. Of course, 'shorten the battery when receiving a particular message' is not a standard feature of most pagers, so you have to modify or swap the PCB anyhow, and putting the electronic ignition in there might be easier.
I concede that just because a battery is not rigged to explode on short it might still explode in other conditions.
Quite a lot of lipo have more than two leads, starting at a third thermistor wire, going up to per cell voltage leads, and eventually going to annoying Apple bullshit.
And even with two leads, if you're manufacturing a thousand battery-bombs, there's a lot of ways to do a one-wire (and ground) protocol to pass data to a microcontroller, which can easily be the size of a grain of rice. Or you could hard-short the battery leads on a battery without builtin overcurrent protections, and use it as a primary for your real explosives -- even a well-contained lipo fire is definitely hot enough to set off most thermal-ignite explosives.
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