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You can have Home Assistant switch a laptop charger on below a battery threshold and off above a second threshold—but only if Home Assistant can read the laptop’s battery level and control the charger’s outlet. First check whether the laptop already offers built-in charge limits; those may be a simpler option.
What the automation needs
- Battery telemetry: Home Assistant needs a battery-percentage sensor it can read. Its Linux Battery integration reads local Linux system data from
/sys/class/power_supply/. Confirm the reported entity and state on your actual setup before relying on it. Other operating systems, or a laptop monitored remotely, may require a different way to expose battery data. - A controllable charger outlet: A switch entity must turn power to the charger on and off. A smart plug is one possible setup; Home Assistant documents switch entities and the switch.turn_on action. Check that the plug works with your Home Assistant setup and is rated for the electrical load in your region.
- A suitable charging method: The laptop must tolerate having charger power switched externally, or provide a native charge-control feature that better suits the job.
Set up the battery sensor and outlet
Verify the battery reading
For a Linux laptop, consult the Linux Battery integration instructions. Check Home Assistant’s entity state against the laptop’s reported battery percentage and observe that it updates as expected. A sensor that is missing, stale, or unavailable cannot reliably drive threshold automations.
Verify the switch
Set up a Home Assistant switch for the outlet controlling the charger, then confirm that its on and off actions actually change charger power. Do not assume compatibility from a product category alone: integration support and electrical ratings matter.
Use separate thresholds to control charging
Create two actions: turn the charger outlet on when the battery falls below a lower threshold, and turn it off when the battery rises above a higher threshold. Home Assistant supports battery-level threshold triggers, and its documentation describes a trigger that fires when a battery level crosses into a defined zone. See the battery-level crossed threshold trigger and the Battery integration.
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Using distinct lower and upper thresholds makes the gap between the on and off points explicit, instead of making both actions respond to the same boundary. Choose values for your own laptop and use case; the available documentation does not establish a universally optimal charging range or prove that this approach extends battery life. It also does not provide a tested, one-size-fits-all automation configuration.
Before depending on the setup to run a server, supervise a full cycle: watch the battery sensor cross each threshold, confirm the switch changes state, and verify that the laptop responds as expected. Consider what should happen if Home Assistant, the network, or the plug becomes unavailable; the behavior depends on your particular equipment and configuration.
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Check for built-in battery charge limits
Some laptops let you set charging start and stop levels in firmware or manufacturer software. For example, System76 documents laptop battery thresholds, while ASUS documents battery care modes in MyASUS. Availability and behavior depend on the exact model. Check your laptop’s own BIOS, firmware, or manufacturer support information before choosing an external outlet automation.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsNative controls avoid making Home Assistant switch the charger’s power, but they may not expose a battery sensor to Home Assistant or offer the automation you want. An outlet-based approach can use Home Assistant’s readings and actions, but depends on a working sensor, switch, connection, and suitable laptop behavior. Compare those requirements with the laptop’s native options rather than assuming one method fits every server.
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- 【Smart Charging for Devices】Automatically cuts power once your device reaches the low-battery limit you set, preventing overcharging.
- 【Auto-Shutoff】Prevents electrical overload by automatically shutting off devices that use too much power.
- 【Voice & Remote Control】 With built-in support for both Alexa and Google Assistant, issue simple voice commands to adjust settings, turn devices on or off, or even access specific functions without lifting a finger. Manage Tapo P115 and its connected devices from anywhere with the user-friendly Tapo app.
Interpret charging events carefully
A “battery stopped charging” event does not necessarily mean the battery reached a charge limit: Home Assistant says it can happen when the laptop is unplugged or when charging finishes naturally. If your automation must distinguish those cases, combine the event with battery level and the state of the charger switch. See Home Assistant’s Battery stopped charging trigger.
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