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Vision Pro Teardown—Why Those Fake Eyes Look So Weird
(www.ifixit.com)
This is a most excellent place for technology news and articles.
What? That's not a fire hazard at all. Your second battery would provide at most 100 watts which is perfectly safe and not going to cause any fires.
If you submerge the battery in water or stab it with a knife... sure it might catch fire. But that's pretty much the only risk so long as you stick to reputable brands that comply with safety standards.