Hi,
As Spindle Ninja said it takes time to charge, but nothing to be concerned looking at other parameters.
Looking at the details you shared:
Current Crtical Low Warning Low
Bat Run Time critlow 36 hr 76 hr 78 hr -- --
For your information : if the Bat 'run-time' is less than '78-hr Warning' or less than '76-hr Critical', this message will be produced. However, Once the battery charge hours is above 78 hr, this message should stop.
Looking at the other parameters you shaerd such as:
Bat Curr normal = 500 mA
Charger Volt normal = 8200 mV
FYI : If the battery is fully charged : Then charger_volt will be 8200 mV and Bat_curr will show 0mA. However, it shows 500 mA, that's a sign it's charging....!
What to do: Just wait, the battery will regain charge, take a look in regular intervals, Bat run time capacity should be restored. If it does not then get in touch with support.
Thanks!