Editing Lithium polymer battery (section)

== Voltage and state of charge ==
{{main|Lithium-ion battery#Charge and discharge}}

The voltage of a single LiPo cell depends on its chemistry and varies from about 4.2&nbsp;V (fully charged) to about 2.7–3.0&nbsp;V (fully discharged). The nominal voltage is 3.6 or 3.7 volts (about the middle value of the highest and lowest value) for cells based on lithium-metal-oxides (such as LiCoO<sub>2</sub>). This compares to 3.6–3.8&nbsp;V (charged) to 1.8–2.0&nbsp;V (discharged) for those based on lithium-iron-phosphate (LiFePO<sub>4</sub>).

The exact voltage ratings should be specified in product data sheets, with the understanding that the cells should be protected by an electronic circuit that won't allow them to overcharge or over-discharge under use.

LiPo [[battery pack]]s, with cells connected in series and parallel, have separate pin-outs for every cell. A specialized charger may monitor the charge per cell so that all cells are brought to the same state of charge (SOC).