One or different capacity batteries together using what problem?
If you mix old and new batteries or different capacity in use, leakage may occur, the zero-voltage phenomenon. This is due to the charging process, the capacity differences lead to charge when the battery is charging, battery is not fully charged, discharge with high capacity battery is not discharged, are of low capacity. Such a vicious cycle, damage and leakage of battery fluid or low (zero) pressure create a security risk.
Second, the basic characteristics of lithium-ion batteries?
1, high energy density: lithium-ion battery is the weight of the same volume of nickel-cadmium or nickel-metal hydride batteries half volume is characteristically nickel-cadmium, nickel-metal hydride 40-50%.
2, high voltage: the voltage of a lithium-ion battery 3.7V (average), the equivalent of three NI-CD or Ni-MH batteries in series.
3, no pollution (environment), lithium-ion batteries do not contain heavy metals, such as cadmium, lead and mercury.