If you are still accepting ideas for WipperSnapper components, can I suggest adding a feed for the battery monitor on boards that support it, e.g., the ESP32-S2 Feather? This would allow easy monitoring of battery-powered IoT devices, as well as the creation of triggers for when a battery needs recharging.
I see from the documentation that the battery monitor reports over I2C, so hopefully not too much of a stretch.