Did they though? LiPo batteries can go off with quite a bang if they're overcharged and mishandled. I'm thinking it's possible they managed to implement a firmware hack of the battery management system and used the battery itself as an explosive.

Still diabolical, but not as involved as intercepting and modifying thousands of pagers and walkie-talkies. It would also be limited to only those units that used a BMS that Israel had identified an exploit for.