Using Microsoft Surface UEFI Configurator
Surface UEFI firmware update, available through Windows Update or via the MSI driver and firmware packages on the Surface Support site. The Battery Limit UEFI setting is built into Surface devices by default including: If you enable Battery Limit while the device is above 50% charge, the Battery icon will show that the device is plugged in but discharging until the device reaches 50% of its maximum charge capacity. Therefore, it will show that the battery is charged up to 50% and will not charge beyond this limit. The charge level reported in Windows will reflect this limit. When Battery Limit is enabled, the battery charge will be limited to 50% of its maximum capacity. It was really a lot of work to workaround that, so I hope you appreciate this. The new Internet Explorer in 8.1 is really buggy in combination with gadgets.
Setting the device on Battery Limit changes the protocol for charging the device battery. All gadget settings will remain during the update to 8.1 if you install this version. This setting is recommended in cases in which the device is continuously connected to power, for example when devices are integrated into kiosk solutions. Then we integrate the needs of pro athletes into our process of creating the best gaming gear possible.
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Battery Limit option is a UEFI setting that changes how the Surface device battery is charged and may prolong its longevity. PRO Series is truly designed with and for pros.