Durability and reliability. Two important criteria for buying the best and most economical button batteries for your hearing aid. GP is a renowned battery manufacturer who has excellent button cells for a variety of hearing aids. The color of the 13 button cell type is orange. A zinc-air button cell for hearing aids with a diameter of 7.9 mm and a height of 5.4 mm. The button cells rank among the best in continuous testing. To give an indication: With normal daily use (12 hours per day) the lifespan is about 11 days. The batteries function properly, both in very cold weather and in extreme heat. The voltage is 1.45 volts. The batteries are not rechargeable. The handy blister pack contains 6 button cells. Tip: Always keep a set of batteries in stock so you can change them easily. GP has a very large range of button cells, which work perfectly in terms of reliability and safety. You can prevent leaking batteries by always disposing them immediately. Always keep the button cells out of th