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Why Is Your Old Phone Battery Swollen? | iFixit News
(www.ifixit.com)
This is a most excellent place for technology news and articles.
We had like six batteries for our (local firefighter department) drone, but always charging 2 to the may in case of an emergency. We already blew up one, three to follow. They are bloated a bit, but enough for them to get stuck in the drone often, and even a little bit is a lot for a rectangular battery. And they hold basically no charge anymore.