Understanding the thermal ceiling in portable power

Published Sep 9, 2026 • 8:18 AM

The short version

It’s the connected device protecting itself.
As temperature rises during charging, a smartphone’s battery management system reduces the current it will accept…

Plug a phone into a modern charger and the first 10 minutes are impressive. The next 20 are not. This is not a defect.

It’s the connected device protecting itself. As temperature rises during charging, a smartphone’s battery management system reduces the current it will accept, because heat accelerates the chemical degradation that permanently reduces…

Read the full story at MIT Technology ReviewOriginal

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