Neewer Replacement Battery For Canon Digital IXUS 30 40 50 New Canon NB-4L compatible Li-Ion Battery Never run out of battery power when you're just about to capture the perfect moment! Time to get extra power for your digital video camera/camcorder. High capacity, rechargeable DC 3.7V Li-Ion Battery technology gives the best performance possible compared to other battery technologies such as Nickel Metal Hydride (Ni-MH). Li-ion battery, long life cycle, charge and discharge over 5 times. No Memory Effect: Can be partially charged without reducing battery capacity and shorten the battery life.