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We all know that heat is the enemy of Li-ion batteries. I'm working remote in SE Asia, and even with office A/C it's very hot here. This laptop is a little over a year old, has never been used outdoors or outside an office, and it's already in "Service Battery" mode and shutting down at around 70% charge.

Something sounds very wrong there. Unless you are regularly using it in areas above 35° C it shouldn't really matter.

Clarification: I have used this in rooms with no A/C, but to my knowledge it's never been in a room with temperatures above what Apple recommends as above normal range.

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