# Battery fuel gauge

Canonical URL: https://eloragrid.ai/symbols/battery-fuel-gauge
Publisher: Elora Grid
Updated: 2026-10-27
Lookup label: SoC
Drawing use: Schematic
Reference families: Manufacturer

A battery fuel gauge estimates how much usable charge remains in a battery.

## In plain English

### What does Battery fuel gauge mean?

A battery fuel gauge estimates how much usable charge remains in a battery.

### A simple example

An operator display can show a charge estimate instead of only battery voltage.

### What the drawings help you do

Show the measurements entering the gauge and the charge estimate sent to the controller. A fuel gauge is like a battery dashboard: its estimate depends on the battery model and measurements, rather than simply reading the voltage once. Keep the measurement path separate from the battery’s main power cables.

### Before using this reference

- Identify the battery chemistry and pack arrangement.
- Label measured voltage, current and temperature where used.
- Name the reported estimate and the controller receiving it.

### Does 50% charge mean half the operating time is left?

Not necessarily. The load, temperature, battery condition and the gauge’s estimation method affect operating time. State of charge is an estimate of charge remaining, not a promise about runtime.

### Terms

- State of charge: An estimate of the charge remaining compared with the battery’s usable charge capacity.
- Fuel gauge: Electronics and an estimation method that report battery status.

Concept diagram: Battery measurements → Charge-estimation function → State-of-charge report
Original functional explanation. Arrows show information or energy roles; two-headed arrows identify two-way interfaces. This is not a pinout, certified standards graphic or complete circuit.

- [Battery management functions](https://www.ti.com/product-category/battery-management-ics/overview.html)


## What it represents

A battery fuel gauge estimates how much usable charge remains in a battery.
An operator display can show a charge estimate instead of only battery voltage.
Show the measurements entering the gauge and the charge estimate sent to the controller. A fuel gauge is like a battery dashboard: its estimate depends on the battery model and measurements, rather than simply reading the voltage once. Keep the measurement path separate from the battery’s main power cables. This is original functional artwork, not a certified standard graphic or device pinout.

## How to read it

- Identify the battery chemistry and pack arrangement.
- Label measured voltage, current and temperature where used.
- Name the reported estimate and the controller receiving it.
- An estimate of remaining charge is different from a guarantee of remaining operating time.

## Information to show or reference

- Identify the battery chemistry and pack arrangement.
- Label measured voltage, current and temperature where used.
- Name the reported estimate and the controller receiving it.

## Important distinction

An estimate of remaining charge is different from a guarantee of remaining operating time.

## Facts

- Representation type: Original functional block; not a certified IEC or IEEE graphic
- Concept input: Battery measurements
- Concept output: State-of-charge report

## Public references

- [Battery management functions](https://www.ti.com/product-category/battery-management-ics/overview.html) — Texas Instruments. Battery management functions: public technical context for the named function. Product and compliance details remain with the publisher.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.