I’ve been keeping the charger tethered on the SUPPLY mode while using Stretch, but this evening I started to hear an intermittent double beep sound suggesting that the battery voltage had dropped below the low voltage threshold (as per Battery Maintenance Guide - Stretch RE1 - Hello Robot Documentation). When I then plugged in the charger in 12V AGM mode, I saw the charger switching off intermittently as shown above.
- Is the discharge despite keeping the charger attached in SUPPLY mode expected? Or does this suggest some other issue with the charger.
- I have now placed the charger in SUPPLY mode again based on the instructions for recovering from low battery voltage. But if there is an issue with SUPPLY mode (since the charger was in this mode all through Stretch’s usage), I’m not sure if this will work. What are some ways to debug what the issue might be here? Or to make sure that the SUPPLY mode (and the charger generally) is working correctly? I’m curious if there are some quick ways since waiting for the charging to finish could take 4 to 8 (or more) hours.