@lunarised
1) the pagers were deadly cause they put literal explosives (like C4) in them, not because of lithium batteries.
2) EVs CAN be compromised so that their batteries ignite, in fact China has EVs randomly burst into flames all the fricking time (btw, never buy a Chinese car). But unless the EV is parked directly next to a building, or something else, it will only burn itself out. You're not gonna get 1 EV to take out a city block, or half of it, or whatever, by exploding. Worst thing you can do, is park it very close to buildings, so that the fire spreads from the EV.
3) If you're thinking about compromising an EV with C4, I guess you could eventually put enough in it to blow up a city block. But by the time you carve out enough space in the car's guts for the C4, it's gonna be hard to miss that someone transformed your favorite Tesla into a bomb on wheels. The reason the pager thing worked in the first place, is because nobody even considered there could be room inside it for some extra C4, so nobody took the precaution to take one apart to look.