Hitech iC-108UL smart quick charger charges 2 or 4 units of AA and AAA Ni-MH/ Ni-CD rechargeable batteries in 1.5 to 6.5 hours. Two sets of individual charging channel with 2 respective LED indicators. LED light turns red when charging batteries and the light turns green when charging is completed. Microprocessor controlled for fast and safe charging, with Negative delta Voltage (V) detection. Reverse polarity protection that prevents damaging the charger and batteries if batteries were installed incorrectly. Equips with smart features such as alkaline battery detection capability, temperature protection (to prevent overcharging), short circuit protection and safety timer function. iC-108UL has safety standard of UL / CUL. Its compact size, light weight and universal voltage (100V-240V) features make it easy for travelling and for storage. Excellent for digital cameras and portable electronics. Recommended to use with Yuasa AA and AAA rechargeable batteries (batteries not included). Please visit our Storefront to view a complete line of Yuasa Ni-Mh AA and AAA batteries. Charging current is 450mA (max) and charging time: AA size battery (600-1100mAh) : 1.5 to 2.5 hours AA size battery (1200-2000mAh): 2.5 to 4.5 hours AA size battery (2100-2500mAh): 4.5 to 5.5 hours AA size battery (2600-2800mAh): 5.5 to 6.5 hours AAA size battery (200-350mAh): 0.5 to 0.9 hours AAA size battery (600-1000mAh): 1.0 to 2.5 hours NOTE: For optimum result, always charge batteries with the same capacity and chemistry in pairs.