Battery watcher

[Robadob]

Add code for checking battery state.

Also add a warning when battery is low?

[Robadob]

Appears we have available to us.

The batteries voltage and current draw (amperage), rather than a convenience rough charge state method.

Google-fu suggests the only way to provide a rough estimate at charge, outside of lab circumstances (with the ability to constantly monitor the batteries state) is using the resistance, which we don't have access to.

With a bit of testing, it may be possible to find how these values fluctuate with usage, to make an internal warning though.

[ramsay-t]

There are standard curves for lithium ion voltages. They aren't linear but I can plot one in the eee lab when I get time.

On 10 November 2015 18:08:48 GMT+00:00, Robert Chisholm notifications@github.com wrote:

Appears we have available to
us.

The batteries voltage and current draw (amperage), rather than a
convenience rough charge state method.

Google-fu suggests the only way to provide a rough estimate at charge,
outside of lab circumstances (with the ability to constantly monitor
the batteries state) is using the resistance, which we don't have
access to.

With a bit of testing, it may be possible to find how these values
fluctuate with usage, to make an internal warning though.

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