Option to use Voltage instead of charge?

[derekoharrow]

Checklist

• I have filled out the template to the best of my ability.
• This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
• This issue is not a duplicate feature request of previous feature requests.

Is your feature request related to a problem? Please describe.

Some devices are bad at reporting the state of charge - especially things like Aqara PIRs, etc.

Many devices will, however, report their voltage, which can be used to infer the battery state - e.g. Voltage dropping from 3,005mV to, say, 2,300mV

Describe the solution you'd like

It would be great to have an option to use the Voltage instead of Charge state for specific devices.

Perhaps, a device specific configuration item that says to use voltage instead of charge?

Describe alternatives you've considered

n/a

Additional context

An example of a problematic device:

I have a Xiaomi GZCGQ01LM Lux Sensor. This is reporting the battery state as 0%, and hence battery low. However, the Voltage is being reported as 2,700mV and the device is still working perfectly, and has been for many months.

This would be a great example of where Voltage is a battery indication of battery health than charge.

[andrew-codechimp]

Thanks for the explanation and example, I'll have a think about whether I can handle this in the future.
I am loathe to introduce a lot of config options per device but I'll see what I can come up with.