Panasonic's lithium button battery. These batteries are available in a variety of sizes and capacities to meet your application needs. These non-rechargeable batteries are ideal for small electronic devices and have a longer life than alkaline batteries. These batteries are small, round and slim, and are usually used alone, but can be maintained for long periods of time due to less self-discharge. BR1220 Battery Chemical: Lithium battery size: coin, 12.5mm voltage rating: 3V Capacity: 35mAh Size/Size: 12.5mm x 2.0mm, BR-1220 is a 3V / 35mAh coin cell non-rechargeable battery, using lithium polycarbon fluoride technology, can be customized for additional processing, add solder chip terminals, insulation packaging and configuration type, we can also provide you with BR1220/BN, BR1220/FCN, BR1220/HFN, BR1220/HFN, BR1220/VCN. Coin-type lithium batteries are high-energy, high-reliability batteries for a wide range of applications. The full 3V voltage in these high-energy-density batteries is about twice that of conventional dry batteries. Panasonic coin lithium batteries are polycarbon monofluoride lithium batteries (BR series) for uses that require greater reliability and safety.