Is there a smart battery charger for smaller batteries? It would be nice to see the charge level in Home Assistant. If not I am willing to use a power monitoring plug.
There is this unit that has a display on it and someone with certified experience may be able to convert the output via say an esp32 to bring the read outs into HA
I don’t know… but I wonder if one of the BT compatible chargers (like the SkyRC MC3000) could be used and the data collected?
That has an android and ios app by the looks of it so someone may be able if not already done so pull that data from them that way.