Button cells for many applications The high-quality button cell is the optimal energy source for a wide range of devices. Can be used in calculators, scales, watches, car keys and garage door openers. Reliable, durable and long shelf life Safe packaging - child-safe design and individually sealed. Advice: Not rechargeable In line with German regulations on the disposal of batteries (BattG), rechargeable batteries and other battery types may not be disposed of in domestic waste.