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High precision current type battery capacity tester(also known as coulometer),which can test the voltage, current and capacity of battery to help users know the state of battery in time. Coulometer is suitable for lithium battery, lithium iron phosphate battery, lead-acid battery and nickel-metal hydride battery with working voltage is from 8V to 80V. Voltage range 8V-80V and current range 0-50A Coulometer will show correct battery capacity even when battery is in charging mode. It is suitable for mobile and portable equipment, e-bike, scooters, cars and so on.