Microsoft this week announced a new "Battery Limit" feature (via OnMSFT) for its Surface devices that is aimed at helping them maintain their ability to hold a charge after being connected to external power for long periods of time. Initially available for the Surface Pro 3 and Surface Pro 4, the feature will eventually roll out to further Surface devices in future firmware updates.
The main goal for this feature is to assist in maintaining battery reliability in settings where a Surface may be used in things like kiosks and consoles, where the Surface device is rarely removed from a power source. Microsoft explains:
Battery Limit Mode can be enabled via the Surface UEFI settings under the "Boot configuration" option.
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