- Lithium-ion battery non-constant-voltage charging method for correcting and compensating voltage, stop charging the battery when it is charged to a limited charge voltage U of the battery, characterized in that the limited charge voltage U between the battery positive and negative electrodes is set to U =3U 0 -U S -U SO; U SO is the standard stabilized voltage drop from U 0 which the battery is charged to by constant-current and constant-voltage charging, whose value is selected by the following steps: when stopping constant-current and constant-voltage charging the lithium-ion battery and starting to lay up the lithium-ion battery, start timing; from some time point, the open-circuit voltage-drop of the lithium-ion battery would be smaller than some certain value during some certain time period, which means the battery voltage has already been in a stable state; then select the voltage corresponding to the first time point of said time period as standard stabilized voltage U SO of the battery; U S is the stabilized voltage drop from U 0 which the battery is charged to by constant-current charging, whose value is selected by the following steps: when stopping constant-current charging the lithium-ion battery and starting to lay up the lithium-ion battery, start timing; from some time point, the open-circuit voltage-drop of the lithium-ion battery would be smaller than some certain value during some certain time period, which means the battery voltage has already been in a stable state; then select the voltage corresponding to the first time point of the time period as stabilized voltage of the battery U S; U 0 is standard charge cut-off voltage and commonly recognized by the industry as the charge cut-off voltage used by the low power, constant-current and constant-voltage charging method; wherein the battery is a lithium iron phosphate battery with U 0 between 3.5 and 3.7 V, a lithium cobalt battery with U 0 between 4.2 and 4.5 V, a lithium iron cobalt battery with U 0 between 4.2 and 4.35 V, or a ternary lithium battery with U 0 between 4.2 and 4.35 V. U SO is the standard stabilized voltage drop from U 0 which the battery is charged to by constant-current and constant-voltage charging, whose value is selected by the following steps: when stopping constant-current and constant-voltage charging the lithium-ion battery and starting to lay up the lithium-ion battery, start timing; from some time point, the open-circuit voltage-drop of the lithium-ion battery would be smaller than some certain value during some certain time period, which means the battery voltage has already been in a stable state; then select the voltage corresponding to the first time point of said time period as standard stabilized voltage U SO of the battery; U S is the stabilized voltage drop from U 0 which the battery is charged to by constant-current charging, whose value is selected by the following steps: when stopping constant-current charging the lithium-ion battery and starting to lay up the lithium-ion battery, start timing; from some time point, the open-circuit voltage-drop of the lithium-ion battery would be smaller than some certain value during some certain time period, which means the battery voltage has already been in a stable state; then select the voltage corresponding to the first time point of the time period as stabilized voltage of the battery U S; U 0 is standard charge cut-off voltage and commonly recognized by the industry as the charge cut-off voltage used by the low power, constant-current and constant-voltage charging method; wherein the battery is a lithium iron phosphate battery with U 0 between 3.5 and 3.7 V, a lithium cobalt battery with U 0 between 4.2 and 4.5 V, a lithium iron cobalt battery with U 0 between 4.2 and 4.35 V, or a ternary lithium battery with U 0 between 4.2 and 4.35 V.