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EV Batteries Are Dangerous to Repair. Here’s Why Mechanics Are Doing So Anyway
(www.scientificamerican.com)
This is a most excellent place for technology news and articles.
Lead-acid batteries also present a risk of explosion.
https://en.wikipedia.org/wiki/Lead%E2%80%93acid_battery#Risk_of_explosion
That's why you attach jumper cables to the dead battery first.