Traditional Zinc Cadmium batteries have a way of letting you down. They drain fast and offer a very low operating time. On the other hand, Alkaline batteries last at least 3 times longer than normal Zinc Cadmium batteries. These Panasonic AAAA 1.5V Alkaline batteries will offer you a long lasting operating time. AAAA size batteries are most frequently used in laser pointers, LED penlights, powered computer styluses and glucose meters, These Panasonic batteries will be perfect to charge them.