Lithium-ion battery manufacturers tell you the difference between parallel and series batteries

Parallel connection: Several batteries, positive and positive, negative and negative, are connected side by side, the voltage is unchanged, the capacity is increased, and the corresponding current is also increased.

Serial connection: Several batteries are connected together at the head and tail, that is, positive and negative. The negative of the first section is connected to the positive of the second section, and so on. The voltage is increased, and the capacity is unchanged.

Add voltage in series and add capacity in parallel. For example, if you have two 1.5V, 2000mAh batteries, in series, you get a 3V, 2000mAh battery, and in parallel, you get a 1.5V, 4000mAh battery .
If the voltage of the batteries in parallel remains unchanged, the supply current can be increased; if the batteries are connected in series, the supply voltage can be increased, but the current remains unchanged.

In parallel, in order to get more power, two or more batteries can be connected in parallel. In addition to connecting the batteries in parallel, another option is to use larger batteries. Due to the limitations of the batteries that can be used, this method is not suitable for all situations.

In addition, a large-sized battery is not suitable for the form factor required for a dedicated battery. Most chemical batteries can be used in parallel, and lithium-ion batteries work best in parallel. A battery pack consisting of four cells in parallel keeps the voltage at 1.2V while quadrupling the current and runtime.

In series, portable devices that require high power are generally powered by a battery pack of two or more cells connected in series. If a high voltage battery is used, the size of the conductors and switches can be made very small.

The advantages and disadvantages of charging and discharging batteries in series and parallel
1. The advantages of parallel discharge of batteries: let each battery not discharge, balanced, very good! There is no disadvantage, the disadvantage is the imbalance or other faults inside the battery.

2. Disadvantages of series discharge of batteries: when batteries are discharged in series, the discharge time is limited by the smallest capacity, which is easy to cause the electricity with large capacity not to be discharged, and the overdischarge of small capacity;

3. The series discharge of new batteries is no problem, but the series discharge of old batteries, especially batteries with large differences in capacity, is not suitable!

The advantages and disadvantages of charging and discharging batteries in series and parallel

2. Charging
1. Disadvantages of constant current charging of batteries in parallel: it is easy to cause a single bias current to generate heat and thermal runaway, and the others only generate heat one by one.

2. The advantages of battery parallel constant voltage charging: the battery is not easy to be overcharged, and it is easy to balance the voltage;

3. The advantage of battery series charging: let each battery charge the same amount of electricity;