Although the circuit drawing does not significantly load the low power of the test battery, it should not be permanently connected. The circuit uses the familiar LM3914 (IC1) to show the voltage level. LED readout creates battery status readout: When the top LED is on, the battery is fully charged. When the bottom LED lights, the battery needs to be charged soon! Switch S1 selects between 12 V and 6 V operation. Series diode D1, beam driver to prevent reverse supply voltage. The display of individual led colors may show a common anode light column display without a better indication of battery status.
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