market will automatically stop charging when the battery is full charged but lack the function from which the users gets audio indication and can attach their next battery for charging.
The circuit shown here is ideal for these purposes and the users can understand that the battery has become full charged, so they can reinstall the battery in the quipment from where it is removed for charging or attach an another battery to charge. The circuit can also be used with solar chargers so you will get indicated when your battery charged by the solar panels so you can charge another battery save the wasted energy of the solar panels.
Here is a very useful project of a battery full charge alarm circuit. The circuit can be used with many different types of batteries with different voltages. It will audibly indicate when the battery is full charged by beep beep buzzer sound. Most of the automatic battery chargers available in the
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