Several factors that affect the remaining battery life of ThinkPad are as follows:

　1) Power management usage plan (highest performance mode, Minimum mode, maximum battery mode).

　2) LCD brightness.

　3) Balance parameter of fan speed.

4) Whether wireless/Bluetooth is turned on.

5) Is the optical drive working?

6) The current workload of the CPU.

7) Whether the keyboard light is enabled, etc.

The battery life advertised to the outside world is the theoretical value of the machine. However, in daily use, the environment used is different and the type of work is different. When the battery is fully charged, the standby time of the machine will also vary. All the same. But no matter what the situation, during the warranty period, as long as the battery's standby time is less than 30 minutes, it can be replaced.

ThinkPad, also known as "ThinkPad" in Chinese, was a portable computer brand under the IBM PC Division before 2005. It enjoys a high reputation in the industry for its ruggedness and reliability. After Lenovo acquired the IBM PC Division, the ThinkPad trademark was owned by Lenovo. Since its inception, ThinkPad has maintained a classic black appearance and has its own unique insights into technology, such as: TrackPoint (pointing stick, commonly known as the little red dot), ThinkLight keyboard light, full-size keyboard and APS (Active Protection System, active protection system) ).

Thinkpad is the most popular portable computer among developers of the open source operating system OpenBSD, and the ThinkPad X40 is one of the most supported portable computer models.