So I noticed my MBP runs about 4C cooler when it's running off battery than while charging. Probably the heat from the excess energy, but it's still a lot. Maybe something for you people using them on your lap all the time?
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Temps lower when not charging...
- Thread starter clickclickw00t
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Perfectly normal and yes it is due to the dissipated heat from the charge cycle taking place while the connector is plugged in. I doubt 4C will make much difference to someones lap but it is a valid point.
What he said.
Charging takes current makes heat.
PLUS when your machine is disconnected from mains power, the CPU, hard disk and backlight are nicked down a notch to enhance battery life. There may be other economies coming into play, too: maybe WiFi power, perhaps GPU mode (depending on your model), etc etc.
I'm mildly surprised the difference isn't greater than 4C.