Want to protect your iPhone's battery health? Stop doing this
Briefly

"Batteries are sensitive to temperature changes, and they prefer the sorts of temperatures that we humans like. Stray even a few degrees away from comfortable room temperature, and batteries won’t be able to hold as much charge..."
"You should try to keep your iPhone and any other device containing a battery -- at around 18°C/64°F, give or take a couple of degrees. Stray beyond this, and your battery will feel additional strain..."
Read at ZDNET
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