How to connect two car batteries in series to charge together?

Two 12V batteries are connected in series, that is, 24V；; The way we connect in series is to connect the anode of battery A and the cathode of battery B, and we form a 24 volt battery pack. The anode of battery B is the anode of this group of batteries, and the cathode of battery A is the cathode of this group of batteries.

12V lithium battery, 12V lead-acid battery, 12V nickel-hydrogen nickel-cadmium battery, 12V alkaline battery. 12 lithium battery is composed of three 3.7V lithium batteries connected in series. When a single lithium battery is fully charged, the voltage is 4.2V, which is commonly known as 4V. Increase the voltage of series batteries, that is, 4v/ battery * 3 batteries or = = 12V.

As shown in the figure below:

Extended data:

Precautions:

1. Check the electrolyte level regularly. If it is lower than the minimum liquid level calibration line, please replenish it immediately. If you continue to use it in this state, it will not only accelerate the aging of internal parts of the battery, shorten the service life of the battery, but also cause an explosion.

2. Do not put the battery near an open flame (matches, lighters, lighted cigarettes, etc.). ), and don't cause sparks because of the short circuit of electrical appliances near the battery.

3. When charging the battery, please read the battery label carefully and take the battery out of the machine.

4. The battery electrolyte (dilute sulfuric acid) is corrosive and cannot be directly contacted. Once the eyes, skin and clothes are stained with electrolyte, please wash them thoroughly with water immediately. If the electrolyte enters the eyes, you should go to the hospital for necessary treatment in addition to washing it with clear water immediately.

5. Maintain the battery regularly.