Reliable replacement: this pack of reliable high-quality size 13 orange hearing aid button batteries is the ideal replacement energy source for hearing aids and hearing aid sound amplifiers. These batteries are also mercury-free making them great for the environment! Zinc air: these batteries with modern zinc-air-technology (1.45V) are air-activated, the sealed Sticker allows them to remain inactive until removed. Once peeled off the battery, oxygen will interact with zinc In battery and activate. Wait at least 1 minute after removing the sticker to fully activate before placing it in The hearing device Pack of 6: This pack of size 13 orange 1.45V hearing aids includes 6 hearing aid batteries. Each button batteries measures 7.8 x 7.8 x 5.4 and weighs 5G Long life: these hearing aid batteries offer reliable performance and long durability with very good price-performance ratio. The shelf life of these batteries is up to 4 years Perfect size: These size 13 orange hearing aid is most commonly used in slightly larger behind the ear and in the ear devices that deliver greater levels of amplification and usually offer telecoil connectivity