The Maxell CR1220 3V Lithium Coin Battery -5Pcs. is the perfect source for a wide range of very small-scale electronic devices. Two or more conventional batteries can be replaced by a single lithium battery. That’s because there’s a lot of power in this ultra-compact design: 3V. Typically used in small, high-performance devices like cameras, glucose meters, and alarm systems.90% of their original capacity, that’s how much power the Maxell CR1220 Lithium coin batteries still have after 10 years. Their chemical stability, which is due to the combination of lithium and manganese dioxide, is very high. Long-term discharge has been verified at all operating temperatures under low-load discharge conditions.