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Battery

Li-On Battery Charger via USB

li-ion-battery-charger-via-usb-schematic-schematic-thumb.jpg

A USB port is a great power source for charging a single cell li-on battery. It is capable of supplying maximum 5.25V and 500 mA.

Economic Battery Sufficiency Tester by BC547

Economic Battery Sufficiency Tester Schematic

Battery level indicators generally detect  the voltage levels of the batteries to give a result. So, tester circuits must not be a heavy load during the measurement process.
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