I’ve succeeded in getting a working battery monitor kernel module. This is basically taking the application note by Technologic Systems and spinning that into a power supply class driver that reports the voltage via sysfs.
As it happens, the battery module in collectd does not see this as a “battery”, something I’ll look at later. For now the exec plug-in works well enough. This feeds through eventually to an InfluxDB database with Grafana sitting on top.
https://netmon.longlandclan.id.au/d/IyZP-V2mk/battery-voltage?orgId=1
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