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12v battery monitor, LCD 12V Digital Battery Capacity Tester Lithium Battery Volt Meter Percentage Display Voltmeter Voltage Indicator ((10-100V) Blue + Alarm): Amazon.com: Electronics, Amazon.com: Renogy 500A Battery Monitor with Shunt, High and Low Programmable Alarm, Voltage Range 10V-120V and up to 500A, 20ft Shielded Cable, Compatible with 12V Lithium Sealed, Flooded Batteries :