If, however, the battery's run out, they won't report a location at all (or will show their last location before shutting down).

Source: https://www.forbes.com/sites/anthonykarcz/2023/12/17/5-apple-airtag-tips-to-keep-your-stuff-safe-when-you-travel/

Malfunctioning battery sensors can also cause charging issues, as they may not accurately detect the battery's charge level and prevent the laptop from charging as a result.

Source: https://www.devicemag.com/lenovo-laptop-not-charging/

The battery's internal temperature remains relatively constant throughout the charging and discharging cycles, due to its endothermic and exothermic properties.

Source: https://investingnews.com.au/altech-launch-of-cerenergy-10-mwh-gridpack-design-for-renewable-energy-storage-market

Try to keep your phone between 50 and 80 percent charged, as depleting it completely or keeping it topped up all the time can decrease the battery's efficiency over time.

Source: https://www.wired.com/story/key-settings-to-change-on-samsung-galaxy-phones/