Lithium air battery
4.2.7 Lithium air battery Lithium air battery offers the best energy-to-size ratio compared to mercury, silver oxide and zinc air so far. Similar in physical appearance as the named cells. Button cell Merits It has a very long shelf life of up to 5 years to reduce capacity to 90% before being de-energized, It has high e.m.f. of about 3.8 volts Uses Backup batteries for low-power computer memories, commonly known as CMOS battery Portable devices where they are soldered into their circuits to last several years. Nb . This battery should not be confused with the lithium ion battery used in cell phones which are secondary battery. This is covered in KCSE Electricity Form 3 course work under storage batteries.