Addendum to the user manual

User Manual Addendum
1. Notes on charging the built-in lithium battery
Please note that your device contains built-in lithium batteries. The
charging capacity of lithium batteries will decrease over time due
to their self-discharge characteristics. To ensure the longevity of
your device's battery, we recommend charging the built-in lithium
battery to around 100% every 3 months when the device is not in
use.