Before you charge the battery, you should warm up the frozen electrolyte in your battery. Also make sure that both vehicles do not have electrical contact between them (due to the possibility of a short circuit when connecting the positive poles), and the discharged battery is properly connected. Turn off the ignition on your car.
Start the engine of the vehicle with the donor battery and set the engine speed to medium.
Connect positive (+) cable A to output (+) 1 low battery and then to the output (+) 2 donor batteries.
Connect the negative cable (-) To the conclusion (-) 3 donor batteries and then to the output (-) 4 dead batteries.
Check that the connecting cables A and B do not have any contact and that the positive cable A does not have contact with any metal parts of the vehicle with the donor battery.
Start your car engine as usual. After starting the engine, disconnect cables A and B in reverse order (4-3-2-1).
Attention! Do not allow electrolyte to come into contact with skin and eyes, do not use open flames near the battery, when working in the engine compartment, remember that the cooling system fan may turn on at any time.