Note: This feature is not currently finished. Configuring Charging Thresholds (Open Firmware) (If a system has Open Firmware, then it must also have Open EC to work with charging thresholds.) See Charging Thresholds for Open Firmware systems or FlexiCharger for proprietary firmware systems. To determine if your laptop has Open Firmware or proprietary firmware, see this article. This is useful when your laptop is plugged into an AC power adapter for extended periods of time, as it prevents unnecessary micro-charging that would reduce battery longevity. Charging thresholds allow your System76 laptop to avoid charging the battery until it has dropped below a lower bound (the start threshold), and to stop charging when it reaches an upper bound (the end threshold).