Li-ion/Li-Polymer Battery: the popular battery in recent years, take advantages of light weight, small volume in the portable field, applied widely in mobile phone, portable tool, tracking system, and test machine.
Characteristics
Nominal voltage: 3.7 V; Working voltage: 2.75~4.2 V.
Highest energy density, both volumetric and gravimetric
Long cycle life
No memory effect
Environmentally friendly. Deleterious metals such as Hg, Cd, Pb are not contained.
Light weight and small volume
Over voltage/lacking voltage protection are needed, and the voltage protection is monitored by the outside circuit.
Self discharge is about 6% (20℃,30 days after fully charged), and would increase as the temperature increases.