> Your computer power supply has a ~400 volt rail in it. Are you unwilling to ever open a desktop computer?
If it's plugged in and turned on - yeah, sure, I don't want to muck around in there. The thing is, my computer power supply:
* Can be completely physically disconnected from the rest of the computer
* Doesn't have a battery in it
If I pull the plug on my desktop, disconnect the power supply, and maybe if I'm being really paranoid touch a lamp to it just to be sure there isn't anything trapped in a cap or inductor, I know that that 400 volt rail is actually at zero volts relative to anything near me. Batteries? Especially power batteries that I can't guarantee are physically disconnected, and that can't really be grounded because they're inside an insulated mobile platform? It's more like looking inside a microwave oven or a CRT, and you're damn right that I don't open those up.
Any work done on a car w/ airbags (the last 20 years) has had a risk of airbag explosion with any localized short.
The Takata airbag recall means that many of these may shoot shrapnel at you. And the original airbags were known for occasionally flinging phosphorous at you.
Beyond that, Lead Acid batteries can be dangerous when the battery or the alternator fails - that's not steam, that's sulphuric acid steam.
I don't know why airbags aren't opto-isolated digital devices activated by simple challenge and response over canbus (read a single byte off address 0, write the same byte back to address 1 to trigger). I'd have expected pyrotechnics to have been first on the list for conversion to digital.
If it's plugged in and turned on - yeah, sure, I don't want to muck around in there. The thing is, my computer power supply:
* Can be completely physically disconnected from the rest of the computer
* Doesn't have a battery in it
If I pull the plug on my desktop, disconnect the power supply, and maybe if I'm being really paranoid touch a lamp to it just to be sure there isn't anything trapped in a cap or inductor, I know that that 400 volt rail is actually at zero volts relative to anything near me. Batteries? Especially power batteries that I can't guarantee are physically disconnected, and that can't really be grounded because they're inside an insulated mobile platform? It's more like looking inside a microwave oven or a CRT, and you're damn right that I don't open those up.