One can scale the battery "voltage guage" with an offset to improve resolution or use an R divider with a clamp.
This is how Zeners ( and LEDs) work. The Vf depends on the applied current and the tolerance on bulk resistance, Rs above some knee current =Izk.
If you know the characteristics, one could do this with a Zener or LED or a couple signal diodes using the Zener specs which I have converted to a linear formula that works < 10:1 current range.
This just shows a 2V Zener or LED.
simulate this circuit – Schematic created using CircuitLab
This is just another way to measure voltages above the max input range, over a limited range.
I assume you may want to minimize this current from battery drain, so factor the reduced voltage on the diode using the diode linear resistance down from rated current.
Vzt ( Zener Test voltage) @ 5mA
Vzk ( Zener knee voltage) @ 0.5mA
Reducing the Zener current to 0.5mA also reduces the Zener knee voltage by 0.5V from the rated nominal value and is close to the 2.8V.