I looks like auto-scaling for battery is off, which is fine, but could you instead make the axis depended on the device.
For example a tempest device only shows values between 2.33V and 2.81V, a range of 0.48V However the axis goes from 1.60V to 3.7V, a range of 2.1V, more then 4 times too much, which looses detail in the graph.
SKY and AIR units have a different range, though I don’t think any of them goes as low as 1.6V
Or turn auto scaling on. (but I prefer just a better fixed range for the battery power)
My battery has never gone outside of 2.45 to 2.60. It is almost a flat line for the last 8 months.