A battery charge level indicator is a device or feature that shows how much charge is left in the battery. It gives users important information about the remaining battery, allowing them to plan their usage accordingly. Battery meters are often found in many electronic devices such as smartphones, laptops, and mobile devices.

Gauges often use graphical representations such as bar graphs or percentage displays to convey the capacity of the battery. This information helps users estimate how long their device can run before needing to be recharged. Some indicators also include additional details, such as estimated time remaining or an alert when the battery reaches a critical level.

Battery level indicators are important because they allow users to effectively manage the energy of their device, ensuring uninterrupted use and eliminating the need to shut down. They play an important role in our daily lives, keeping us connected and efficient while monitoring the health of our batteries.

Components required:

1. LED (red-2nos, yellow-2nos, green-1nos)
2. IN4007 Diode
3. 4.7K Resistor (5 nos)

Circuit diagram:

Working:

The above system works on voltage input which starts with 24 volts. Accordingly when voltage is above 20 all the lights will glow. Below 19 only four will glow. Below 16 only three will glow. Similarly below 12 two and below 5v only one will glow. The levels showing by the indicator provides approximate indication in multiples of 20%. 

Applications:

The battery level indicator is very easy and convenient to use for electronic users.

1. When using a device equipped with a battery meter such as a smartphone or laptop, users can easily check the remaining battery by viewing the screen.
2. Users can determine when the device needs charging to prevent an unexpected shutdown by constantly monitoring the battery indicator. 
3. The battery level indicator also helps users plan their activities accordingly. 

In general, using the battery level indicator allows the user to understand the power of the device, improve battery usage and ensure no interruptions when needed. It provides convenience and peace of mind by helping users get the most out of their electronic devices.

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