The pill box needs to be charged about once a week and you charge it best with the included cord and adapter. It takes about 2 hours to fully charge it, and if you want you can continue to have the charging cable plugged in even though it is fully charged. You will also see the battery status under the Dashboard tab and then the symbol at the top right.

The pill box flashes yellow when the battery is below 20% - then you need to charge it soon. While the pillbox is charging, it flashes green.

You can use the pill box as usual while it is charging and flashing green.
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The pill box may flash red when it starts to charge after being discharged for a while, it will then switch to flashing green as usual.