(JP9106835-A)      The battery includes a lithium insertion compound cathode, a lithium compound anode and a separator. A non-aqueous liquid electrolyte is incapable of polymerising at voltages greater than a maximum operating voltage of the battery. A monomer additive is mixed with the liquid electrolyte.    The additive polymerises at voltages greater than the maximum operating voltage. This increases an internal resistance of the battery. The additive is less than 5% by volume of the mixture of liquid electrolyte and monomer. The additive may be 3-R-thiophene, where R is a halogen.    USE/ADVANTAGE -   For military or remote power applications. Protects battery from overcharge due to additive. Improved safety.    (US5879834-A)      The battery includes a lithium insertion compound cathode, a lithium compound anode and a separator. A non-aqueous liquid electrolyte is incapable of polymerising at voltages greater than a maximum operating voltage of the battery. A monomer additive is mixed with the liquid electrolyte.    The additive polymerises at voltages greater than the maximum operating voltage. This increases an internal resistance of the battery. The additive is less than 5% by volume of the mixture of liquid electrolyte and monomer. The additive may be 3-R-thiophene, where R is a halogen.    USE/ADVANTAGE -   For military or remote power applications. Protects battery from overcharge due to additive. Improved safety.    (JP3061756-B2)      The battery includes a lithium insertion compound cathode, a lithium compound anode and a separator. A non-aqueous liquid electrolyte is incapable of polymerising at voltages greater than a maximum operating voltage of the battery. A monomer additive is mixed with the liquid electrolyte.    The additive polymerises at voltages greater than the maximum operating voltage. This increases an internal resistance of the battery. The additive is less than 5% by volume of the mixture of liquid electrolyte and monomer. The additive may be 3-R-thiophene, where R is a halogen.    USE/ADVANTAGE -   For military or remote power applications. Protects battery from overcharge due to additive. Improved safety.