Vehicle jump starter device

A jump starter device comprising

• a battery;
• output terminals,
• wherein the output terminals are configured to be connected to any of
• connectors in the vehicle with the connectors configured to be connected to terminals of a battery in the vehicle and with the terminals of the battery connected to or disconnected from the connectors,
• the terminals of the battery with the terminals of the battery disconnected from the connectors, or
• terminals of an external power supply;
• a controllable switch,
• wherein terminals of the battery are connected to the output terminals through the controllable switch;
• a load sensor,
• wherein the load sensor comprises a first circuit connected to the output terminals,
• wherein the first circuit is connected to the battery through a second circuit,
• wherein the first circuit is configured to provide first and second voltage values related to voltages at the output terminals based on first and second statuses of the second circuit,
• wherein in the first status, the battery is configured to not provide power to the first circuit,
• wherein in the second status, the battery is configured to provide power to the first circuit;
• a controller,
• wherein the second circuit is coupled to the controller to be controlled by the controller to toggle between the first and second statuses,
• wherein the controller is connected to the load sensor to receive the first and second values to determine a connectable condition between the jump starter device and the vehicle,
• wherein the controller is connected to the controllable switch,
• wherein the controller is configured to turn on the controllable switch when detecting the connectable condition.

A method comprising

• connecting output terminals of a jump starter device to
• connectors in the vehicle with the connectors configured to be connected to terminals of a battery in the vehicle and with the terminals of the battery connected to or disconnected from the connectors, or
• the terminals of the battery with the terminals of the battery connected to the connectors;
• obtaining a first voltage value related to a first voltage at the output terminals,
• wherein the first voltage value is obtained without using a battery of the jump starter device;
• obtaining a second voltage value related to a second voltage at the output terminals,
• wherein the second voltage value is obtained using the battery of the jump starter device;
• analyzing the first and second voltage values to determine a connectable condition between the battery of the jump starter device and the vehicle;
• connecting the battery of the jump starter device with the vehicle when the connectable condition is determined.