How to improve laptop battery life

Firstly, modify various settings. Based on the system version Windows 11 21H2 22000.556, other versions should be similar.

The importance of the following order is decreasing overall, but not as strict.

Firstly, the system’s built-in power mode can be set to “optimal energy efficiency”; For those with particularly strict conditions, the “power-saving mode” can be further turned on.

The path is: (System) Settings – System – Power and Battery – Power – Power Mode; You can also right-click the power icon in the bottom right corner to open it directly.

Power mode and power-saving mode
By the way, the “estimated remaining time” provided by the system is not reliable. It is calculated by dividing the remaining power by the instantaneous power when the power changes (by 1%), which fluctuates greatly. Therefore, the expected remaining time will also have significant fluctuations.

Secondly, it can be switched to the energy-saving mode preset by the manufacturer.

The specific opening method is determined by the manufacturer and specific model, and is generally explained in the accompanying user manual or guide.

For example, Lenovo computers can be switched using the shortcut keys “Fn+Q”; Additionally, you can install Lenovo Vantage in the Microsoft Store (which I personally think is simpler and easier to use than having a built-in computer manager) and switch between them in the bottom right toolbar.

Lenovo Vantage toolbar panel
Specifically, what I want to say about “energy-saving mode” refers to the first icon on the second line, with the official name being “energy-saving mode”; The name of the fourth icon in the first row is “Power saving mode”. Its function is not to reduce energy consumption, but to maintain the battery capacity at 55% -60% when connecting to the power adapter, in order to extend the battery life.

  1. Lower the screen brightness again.

There is no need to minimize the sacrificial experience, just try to reduce it as much as possible based on the premise of comfortable appearance. In addition, whether it is human perception or the brightness level set by the manufacturer, it is generally energy level, not energy level. Avoiding the highest 20% -30% can effectively reduce energy consumption, and further down is not obvious.

Most laptops have brightness shortcut settings for their function keys. Other paths include: (System) Settings – System – Display – Brightness and Color – Brightness; Quick settings at the right end of the status bar.

Brightness settings

  1. Configure the maximum processor state in the power plan.

Change the current plan (specifically, some people may have multiple plans, mainly to modify their own plan), processor power management – maximum processor state – battery usage to 99%.

The path is Control Panel – Hardware and Sound – Power Options – Edit Schedule Settings – Change Advanced Power Settings; You can also use system level search (Xiaona) to search for the keyword “Edit Power Plan”.

Power Plan
I’m not sure about the effect of this, but the reason I made this change initially was that sometimes the fan would run at high speed under low loads, which should be due to the CPU temperature reaching the manufacturer’s preset threshold. After making this change, the CPU temperature under low loads can be significantly reduced. In theory, the energy consumed by a processor is mainly converted into thermal energy (another part is consumed through electromagnetic radiation), so temperature and power consumption should be strongly positively correlated with heat dissipation. A decrease in temperature indicates a decrease in power consumption. See also https://bbs.nga.cn/read.php?tid=26308802 , 6th layer.

In fact, I did not feel that this change caused a significant decrease in performance, so I can also consider changing the “power on” option to 99% to reduce heat generation and noise at low loads.

  1. Reduce the screen refresh rate (if higher than 60Hz) and turn off the dedicated display direct connection (if available).

The former path is the same as the second item – Energy saving mode, and the manufacturer should provide shortcut keys (such as Lenovo “Fn+R”, Energy saving mode may include reducing refresh rate. In addition, a universal path is provided: (System) Settings – System – Display – Advanced Display – Select refresh rate.

Display refresh rate
If you don’t intentionally turn on the direct connection of the independent display, it should be turned off by default; If you turn it on yourself, you should also know how to turn it off by hot switching in the software provided by the manufacturer or switching in BIOS.

  1. Change the software that does not require high performance to kernel processing (with the premise of turning off independent display direct connection).

Actually, it’s not a commonly used software that doesn’t have much effect, it depends on your mood.

The path is: (System) Settings – System – Display – Display Card.

Graphics preferences

  1. Manually eliminate unnecessary high power consuming backend applications.

The path to view the power consumption of the application is: (System) Settings – System – Power and Battery – Battery – Battery Usage.

Dealing with the main issue, forget about applications that are less than 1% and maintain a good mood.

Battery usage
Finally, provide a feasible solution for those who have extremely demanding working conditions, and buy a power bank that supports PD protocol output (preferably 65W or above) for future use. Due to conversion efficiency issues, a 20000mAh power bank can output approximately 60Wh of electricity, which is equivalent to the built-in battery capacity of many 14 inch laptops. When making a purchase, it is important to pay special attention to testing compatibility in practice, at least to ensure that it does not power down. Choose products that support seven day no reason return or offline purchases.

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