ML2020 Rechargeable Battery for car key 1.Nominal Voltage:3.0V 2.Nominal Capacity:45mAh ... 3.Dimensions:20.0*2.0mm 2. car keyPanasonic ML2020H1C Button Cell Battery Application: car key ,remote controls, audio and video equipment ... , miniature instruments, medical equipment, LED flash, card reader, small appliances, alarm system, remote control, electronic dictionary , MP4, digital cameras, all kinds of ...