Our intensive research yields a more effective choice of electrolyte solvent, which forms a protective film over lithium to prevent ionization and self-discharge while in storage. In addition, calcination treatment conditions were set to prevent MnO2 from leaching into the electrolyte, slowing the rate of self-discharge. Panasonic Lithium batteries boast a self-discharge rate of less than 5% after up to 10 years* when properly stored and unused providing, power when it matters most.