A system for determining an indicator of an internal leakage current of a battery entity, wherein the system comprises: - a voltage meter configured to be coupled to the battery entity, wherein the voltage meter is configured to measure a plurality of voltage values corresponding to the battery entity at a plurality of time instants; - an isolator configured to be coupled to each of a battery charger and an electricity consuming entity, wherein the isolator is configured to electrically isolate the battery entity from each of the battery charger and the electricity consuming entity based on a control signal; and - a controller electrically coupled to each of the voltage meter and the isolator, wherein the controller is configured to: - detect a first voltage value at a first time instant while the battery entity is electrically connected to each of the battery charger and the electricity consuming entity; - generate the control signal based on detection of the first voltage value; - detect a second voltage value at a second time instant while the battery entity is electrically isolated from each of the battery charger and the electricity consuming entity, wherein the second time instant is later than the first time instant; - detect a third voltage value at a third time instant while the battery entity is electrically isolated from each of the battery charger and the electricity consuming entity, wherein the third time instant is later than the second time instant; - determine the indicator of an internal leakage current based on each of the first voltage value, the second voltage value and the third voltage value, - determine a first slew rate between the first voltage value and the second voltage value based on the first time instant and the second time instant; and - determine a second slew rate between the second voltage value and the third voltage value based on the second time instant and the third time instant, wherein determination of the indicator of the internal leakage current is based on each of the first slew rate and the second slew rate. - a voltage meter configured to be coupled to the battery entity, wherein the voltage meter is configured to measure a plurality of voltage values corresponding to the battery entity at a plurality of time instants; - an isolator configured to be coupled to each of a battery charger and an electricity consuming entity, wherein the isolator is configured to electrically isolate the battery entity from each of the battery charger and the electricity consuming entity based on a control signal; and - a controller electrically coupled to each of the voltage meter and the isolator, wherein the controller is configured to: - detect a first voltage value at a first time instant while the battery entity is electrically connected to each of the battery charger and the electricity consuming entity; - generate the control signal based on detection of the first voltage value; - detect a second voltage value at a second time instant while the battery entity is electrically isolated from each of the battery charger and the electricity consuming entity, wherein the second time instant is later than the first time instant; - detect a third voltage value at a third time instant while the battery entity is electrically isolated from each of the battery charger and the electricity consuming entity, wherein the third time instant is later than the second time instant; - determine the indicator of an internal leakage current based on each of the first voltage value, the second voltage value and the third voltage value, - determine a first slew rate between the first voltage value and the second voltage value based on the first time instant and the second time instant; and - determine a second slew rate between the second voltage value and the third voltage value based on the second time instant and the third time instant, wherein determination of the indicator of the internal leakage current is based on each of the first slew rate and the second slew rate. - detect a first voltage value at a first time instant while the battery entity is electrically connected to each of the battery charger and the electricity consuming entity; - generate the control signal based on detection of the first voltage value; - detect a second voltage value at a second time instant while the battery entity is electrically isolated from each of the battery charger and the electricity consuming entity, wherein the second time instant is later than the first time instant; - detect a third voltage value at a third time instant while the battery entity is electrically isolated from each of the battery charger and the electricity consuming entity, wherein the third time instant is later than the second time instant; - determine the indicator of an internal leakage current based on each of the first voltage value, the second voltage value and the third voltage value, - determine a first slew rate between the first voltage value and the second voltage value based on the first time instant and the second time instant; and - determine a second slew rate between the second voltage value and the third voltage value based on the second time instant and the third time instant, wherein determination of the indicator of the internal leakage current is based on each of the first slew rate and the second slew rate.