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It's official: Smartphones will need to have replaceable batteries by 2027
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
A heat gun is a specialized tool. That's the problem.
A hair dryer?
Not nearly hot enough for these kinds of applications. And you seriously don't want to dry your hair with a heat gun.
It's like comparing a NERF gun to a howitzer, sure both shoot projectiles...
It's what I literally have used for multiple repairs now, so don't tell me it's not hot enough. iPhone 11, Pixel 5a, and a Samsung Galaxy S21.
It's really not a specialized tool.l at all, there are a million things you can use a heat gun for. And they're like $20 at Harbor Freight.