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Six main parameters of lithium battery

1. Battery capacity

The capacity of a battery is determined by the amount of active material in the battery, usually expressed in mAh or Ah. For example, 1000 mAh means that it can be discharged at a current of 1A for 1h, which translates into a charge of about 3600C.
2. Nominal voltage

The potential difference between the positive and negative electrodes of the battery is called the nominal voltage of the battery. The nominal voltage is determined by the electrode potential of the electrode plate material and the concentration of the internal electrolyte.
Lithium discharge graph, is parabolic, 4.3V down to 3.7V and 3.7V down to 3V, are changing rapidly. But about 3.7V discharge time is the longest, accounting for almost 3/4 of the time, so the nominal voltage of lithium batteries is to maintain the longest discharge time of that voltage.
The nominal voltage of Li-ion battery is 3.7V and 3.87V, if it is 3.7V, the charging termination voltage is 4.2V, if it is 3.8V, the charging termination voltage is 4.35V.
3. Charging termination voltage

When the rechargeable battery is fully charged, the active material on the pole plate has reached saturation, and then continue charging, the battery voltage will not rise, the voltage at this time is called the end of charge voltage. Lithium-ion batteries are 4.2V or 4.35V.

4. Discharge termination voltage

Discharge termination voltage is the minimum voltage allowed when the battery is discharged. Discharge termination voltage is related to the discharge rate. Generally speaking, the unit lithium-ion battery is 2.7V.
5. Internal resistance of the battery

The internal resistance of the battery is determined by the resistance of the electrode plate and the impedance of the ion flow. When the OCV voltage of Li-ion battery decreases, the impedance will increase, so when charging at low charge (less than 3V), pre-charging (trickle charging) should be done first to prevent too much current from causing excessive battery heat generation.
6. Self-discharge rate

Is a period of time, the battery in the case of no use, the automatic loss of power as a percentage of the total capacity. Generally, the self-discharge rate of lithium-ion batteries at room temperature is 5%-8%.