<field>
<id>battery-voltage</id>
<title>Battery Level</title>
<unit>volt</unit>
<min>3</min>
<max>4.4</max>
<interval>0.2</interval>
<decimals>1</decimals>
<colour>black</colour>
<bands>
<band threshold="3.7">
<colour>green</colour>
<text>good</text>
</band>
<band threshold="3.5">
<colour>orange</colour>
<text>low</text>
</band>
<band threshold="0">
<colour>red</colour>
<text>dead</text>
</band>
</bands>
</field>