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Battery testers, battery activation of single instrument is dedicated to maintenance treatment behind battery in portable products, it has three separate ways: battery, battery charging and battery-activated mode. For different behind the battery situation, backward capacity tests batteries, low-voltage constant current charging, or set more than one cycle charging and discharging cycle many times to the minimum capacity of the battery in order to intensify the active substances activate the battery battery plate failure, upgrade behind the battery's capacity.