NB: that's probably backwards. Batteries contain a lot of energy, they just don't release it particularly quickly.
Most explosives have relatively low energy density, however the energy they have is released far faster than with conventional fuels. By unit mass, TNT (or other comparable explosives such as C4, RDX, etc.) have about 1/10th the energy as liquid petroleum fuels (petrol, diesel, kerosene).
Though again most battery technologies also have fairly low energy densities. But those are probably roughly comparable with most mainstream explosives.
TNT has an energy density of 4.184 MJ/kg.
A LiON battery: 0.36–0.875 MJ/kg.
Motorola pagers (a widely used type) seem to typically take a 3.5V 500mAh battery, which if I'm doing my conversions correctly (mAh * V * 3.6) works out to about 23 kilojoule. That would be the energy equivalent of ~5g TNT. A light charge, but one you wouldn't want going off on your hip.
(Note: I've corrected an off-by-an-order-of-1,000 error above, earlier read 23 MJ / 180g TNT. As I said, I'm not entirely certain of my calculations, which are using the Wikipedia energy densities noted and GNU Units.)
Again, batteries won't explode as footage of the presumed Israeli attack on Hezbolla members shows. But they do contain appreciable energy. It would more likely burn rapidly at worst case.
> Motorola pagers (a widely used type) seem to typically take a 3.5V 500mAh battery, which if I'm doing my conversions correctly (mAh * V * 3.6) works out to about 23 MJ.
Batteries should really quote energy, not charge, for this reason. The voltage is not a constant.
But something’s wrong with your math. Even assuming a constant 3.5V, that’s 1.75Wh, and 1Wh is 3600J, so that’s 6300J.
Not sure if you've seen any of the videos that have circulated, but the created explosions was bigger than just getting a bruise on the waist from it. Seems it'd be enough to stand next to someone with one of those pagers to get hurt by it.
Probably because they have been stalking for a while, and this escalation is a precursor to further action. Destroying lines of communication is usually done before military action.
I think the "clever show" was the point. The physical damage may not actually justify the investment here. You need the resultant paranoia and suspicion from Hezbollah or it wasn't worth putting resources into.
