Checking battery status with Power/Test button - AWS310 - AWS310-SITE - AWS810 - AWS810-SOLAR - BMU801

BMU801 User Guide

If there is no DC power available, the battery status LEDs are blank. In that case, you can check the battery status as follows:

Press the Power/Test button briefly.

The battery status LED indicators display the battery status for 5 seconds and return to blank state after that.