A rechargeable battery jump starting device with vehicle or equipment battery detection system, the rechargeable battery jump starting device comprising: a first rechargeable battery having a positive terminal and negative terminal; a positive battery cable connected to the positive terminal of the first rechargeable battery; a vehicle or equipment positive terminal battery connector connected to the positive battery cable; a back-charge diode array connecting the positive terminal of the first rechargeable battery and the vehicle or equipment battery positive terminal battery connector; a negative battery cable connected to the negative terminal of the first rechargeable battery; a vehicle or equipment negative terminal battery connector connected to the negative battery cable; a smart switch configured to disconnect the negative battery terminal of the first rechargeable battery of the rechargeable battery jump starting device from the negative battery cable; and a microcontroller unit having a jump starting device logic configured to be controlled by the microcontroller unit; characterized by the rechargeable battery jump starting device further comprising: a vehicle or equipment battery detection system associated with the rechargeable battery jump starting device for detecting a forward voltage drop across the back-charge diode array, the vehicle or equipment battery detection system including a detection circuit comprising an op amp subtractor (U1B) or difference amplifier and a comparator (U1A), wherein the op amp subtractor (U1B) or difference amplifier is configured to detect the forward voltage drop across the back-charge diodes of the back-charge diode array, wherein the output of the op amp subtractor or difference amplifier is configured to be fed into the comparator, wherein, if a forward voltage drop is detected across the back-charge diode array, and if the forward voltage drop is above a certain threshold, then the comparator is configured to put out a "high" signal, allowing the rechargeable battery jump starting device to continue normal operation; and wherein, if a forward voltage drop is detected across the back-charge diode array, and the forward voltage drop detected is below a certain threshold, then the comparator is configured to put out a "low" signal, the "low" signal being configured to instruct the jump starting device logic controlled by the microcontroller unit to open the smart switch to disconnect the negative battery terminal of the first rechargeable battery of the rechargeable battery jump starting device from the negative battery cable, thus removing internal battery voltage from being applied across the positive and negative battery terminal connectors and rendering the positive and negative battery terminal connectors inactive or dead. a first rechargeable battery having a positive terminal and negative terminal; a positive battery cable connected to the positive terminal of the first rechargeable battery; a vehicle or equipment positive terminal battery connector connected to the positive battery cable; a back-charge diode array connecting the positive terminal of the first rechargeable battery and the vehicle or equipment battery positive terminal battery connector; a negative battery cable connected to the negative terminal of the first rechargeable battery; a vehicle or equipment negative terminal battery connector connected to the negative battery cable; a smart switch configured to disconnect the negative battery terminal of the first rechargeable battery of the rechargeable battery jump starting device from the negative battery cable; and a microcontroller unit having a jump starting device logic configured to be controlled by the microcontroller unit; a vehicle or equipment battery detection system associated with the rechargeable battery jump starting device for detecting a forward voltage drop across the back-charge diode array, the vehicle or equipment battery detection system including a detection circuit comprising an op amp subtractor (U1B) or difference amplifier and a comparator (U1A), wherein the op amp subtractor (U1B) or difference amplifier is configured to detect the forward voltage drop across the back-charge diodes of the back-charge diode array, wherein the output of the op amp subtractor or difference amplifier is configured to be fed into the comparator, wherein, if a forward voltage drop is detected across the back-charge diode array, and if the forward voltage drop is above a certain threshold, then the comparator is configured to put out a "high" signal, allowing the rechargeable battery jump starting device to continue normal operation; and wherein, if a forward voltage drop is detected across the back-charge diode array, and the forward voltage drop detected is below a certain threshold, then the comparator is configured to put out a "low" signal, the "low" signal being configured to instruct the jump starting device logic controlled by the microcontroller unit to open the smart switch to disconnect the negative battery terminal of the first rechargeable battery of the rechargeable battery jump starting device from the negative battery cable, thus removing internal battery voltage from being applied across the positive and negative battery terminal connectors and rendering the positive and negative battery terminal connectors inactive or dead.