This versatile universal battery charger is designed to charge a wide range of 3.7V lithium batteries, including those used in cameras and cell phones. The adjustable charging mechanism accommodates batteries with widths ranging from 1.3 inches to 3.8 inches, making it compatible with various battery sizes and models. Simply insert your battery, adjust the sliding contacts to fit, and connect to any USB power source for convenient charging at home or on the go. The charger features an intelligent chip that provides constant current and voltage regulation for efficient charging while automatically stopping when the battery reaches full capacity. Built-in safety protections guard against overcharging, overloads, and short circuits. The LED indicator system displays blue light when a battery is inserted, red light during active charging, and returns to blue when charging is complete. Charging time varies based on battery capacity, typically taking 3 to 4 hours for a 2600mAh battery. This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm under Proposition 65. The compact ABS construction measures approximately 4.13 by 2.55 by 0.76 inches and weighs just 0.1 pounds, making it an ideal portable charging solution for photographers and mobile device users who need to keep spare batteries ready.