“Is it safe to leave a lithium-ion device in an air-conditioned room whose AC temperature is set at around 20 degrees C?”

(Answer requested by Evan Zanark)

Sure. In fact, one of the oddities of lithium-ion cells and batteries is that they work best at the same temperatures where humans work best: Room temperature — 20C/68F — is great for both humans and Li-ion!

But once you get up to around 40C/104F, both humans and Li-ion batteries will begin to suffer from the heat; performance will do down.

Likewise, once you get down to around 5C/40F, humans and Li-ion batteries will suffer cold-reduced performance.

So, the rule of thumb is simple: Any temperature that feels comfortable to an unprotected human will also be fine for a normal Li-ion device!

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