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Using the MAX8844 lithium ion charger IC released by Maxim Semiconductors you can design an very simple and efficiency charger circuit for charging a single cell lithium-ion battery . The MAX8844 lithium ion charger integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminate the external reverse-blocking Schottky diode to create the simplest and smallest charging solutions for handheld equipment. Lithium ion Charger Circuit diagram Also , using this charger solution the power source is optimized by the MAX8844Z using automatically select function between the USB or IN power source but if are both power sources connected the highest priority is for IN power source to ensure the shortest charging time for the system . The MAX8844 charger chip accept an input voltages range from 4.25V to 28V (IN and USB), but the charging is disabled if the input voltage exceeds +7.5V for protection against unqualified or faulty AC adapters. These charger IC is very...

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.