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Panasonic batteries may be replaced in the use process, so do you know the correct steps for Panasonic batteries replacement?
Replacing batteries is one of the most common service items in maintenance enterprises, but we find that many maintenance personnel do not operate regularly in the actual process of replacement. We will explain how to replace batteries correctly for you.
1. Remove old batteries
(1) To confirm the location of battery installation, most of the models are installed in engine compartment or luggage compartment, and some models are installed in cockpit, so as to do a good job of body protection measures in the corresponding location.
(2) Remove external protective devices such as battery shield, measure the voltage between two poles with multimeter, or view the battery status chart through observation hole, and explain these to customers.
(3) If the vehicle has an anti-theft system (including audio anti-theft), it can be connected with an external power supply first or a battery with sufficient power in parallel. Attention should be paid to connecting the positive pole first and then the negative pole. The positive pole of the external power supply can be directly connected to the positive pole of the accumulator, but the negative pole should not be directly connected to the negative pole of the accumulator, but should be connected to the body iron.
(4) Turn off the ignition switch of the faulty vehicle (some models need to be placed in ON gear, such as Volvo S80 produced before 2005, etc., which should be based on the maintenance manual). First disconnect the negative connection wire of the battery, then disconnect the positive connection wire. If the battery has an air duct, take it off first.
(5) Remove the fixed device of the battery and take out the battery. If the vehicle is connected with an external power supply, be careful not to make the positive connection contact with the body, can be isolated with cotton cloth, etc.
(6) If there is leakage corrosion in old batteries, it is necessary to clean the connection lines of batteries.
2. Installation of new batteries
(1) Before installing new batteries, if the brand types of batteries are not the same, the size of new and old batteries and the location of wiring poles should be compared, and the capacity and cold start current parameters of batteries should be carefully checked. Especially in northern winter, if the cold starting current does not match, it may cause difficulties in starting vehicles.
(2) If conditions permit, the battery detector should be used for testing. Some batteries need to be charged after a long time, although the voltage between positive and negative electrodes is higher than 12V, but the capacity is insufficient, that is, the so-called "virtual electricity". It should be noted that the ambient temperature must be measured when it is higher than 0 C and charged when it is higher than 5 C.
(3) Place the new battery in the installation position and fix it. For batteries with ventilators, don't forget to remove the ventilator connector from the old batteries and install it on the new batteries. For lead-acid batteries, attention should be paid to the tilt angle of the batteries during installation should not exceed 30 degrees.
(4) When connecting the battery connection, the positive pole should be connected first, and then the negative pole. After installation, rust-proof protector or acid-free grease can be sprayed on battery terminal post for protection.
(5) After checking and confirming the fastening reliability, the external power supply can be removed. Start the engine and check the generator voltage. It can be measured at the generator output or on the battery terminal. If special diagnostic equipment is available, the voltage data in the data stream can also be read (Fig. 11). In addition, it is suggested that the idle speed and 2000 r/min should be measured separately.
(6) For vehicles that change batteries due to discharge failure, the dormant current of the vehicle should also be checked. The traditional method is to put the multimeter in the current shield, then connect it in series to the negative circuit of the battery, lock all door locks, close the ignition switch and activate the anti-theft system, and hold it for a period of time until the current is stable.
(7) For vehicles equipped with power management system, sensors are installed in the negative pole circuit. Such vehicles can only use devices such as clamp ammeters for current testing. Generally speaking, the sleeping current of a vehicle should be less than 50 mA (based on the vehicle maintenance manual, for example, some BMW models only require less than 80 mA).
(8) After the battery is replaced, the relevant fault codes recorded in the system should also be cleared by the diagnostic instrument. Vehicles equipped with power management system, such as Mercedes-Benz, BMW and Audi, also need to input the new battery model in power management system and reset the system.
(9) After confirming that the electrical system has been checked correctly, the battery protection device shall be installed, the body protection facilities shall be removed, the engine hatch cover or the baggage hatch cover shall be closed, and the vehicle shall be returned to the customer.




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