Charging batteries is usually a primitive, boring and mundane activity, and it still is. What matters during the charging process, especially for AA/AAA NiMH battery charging? No doubt, accuracy and safety!The creation of NC1500 not only arises out of the need but also from the desire to have a simple but safe and accurate charger for the battery. NC1500 has four independent slots and supports AA/AAA NiMH batteries, offers a maximum charge rate of 1500mA.Four Independent Slot1-4 pcs of NiMH AA, or AAA can be charged at the same time in any combinations.3 Working ModesCharge Mode:   – Charging current adjustable 200mA / 500mA / 700mA / 1000mA / 1500mA.   – Useful when battery needs to be recharged without determining the capacity of the battery. It should be used on batteries known to be in good condition and have been in continuous use.Discharge Mode:   – Discharging current adjustable 100mA / 250mA / 350mA / 500mA / 650mA   – Useful for analyzing the amount of charge stored in the battery. Battery not recharged at the end of the cycle.Refresh Mode:   – First recharges the battery, rest for one hours, discharges, rest, then recharges again. Charging and discharging rates are programmable.   – Reports the discharge capacity at the end of the cycle.   – Useful when the battery capacity needs to be determined. Also useful for battery with degraded performance.Battery Internal Resistance Detection*At the start of a program, the device always performs a quick standard test first in order to determine the internal battery resistance. Aged or poor condition batteries have a higher IR and therefore heat up more during charge or discharge. The values are estimates and will vary depending on the state of the batteries and operation environment.Convenient OperationPowered by smartphone charger, any standard USB adaptor, power banks, and car chargers (5V/2A USB).Specifications:   – USB Input Power: 5V/2.1A   – Trickle Current: 50mA   – Operation Mode: CHARGE, DISCHARGE and REFRESH   – Operating Temperature: 0 ~ 45 ℃   – Charge Current: 200mA / 500mA / 700mA / 1000mA / 1500mA   – Discharge Current: 100mA / 250mA / 350mA / 500mA / 650mA   – Max Charging Capacity: 3000mAh   – Weight: 106g   – Size: 108x73x28mm