The meaning and purpose of battery components are series and parallel. Parallel battery packs require each battery to have the same voltage, output voltage equal to the voltage of one battery, and parallel battery packs can provide stronger current. Series battery packs do not have too many requirements, as long as the capacity difference of the batteries is not much. Series battery packs can provide higher voltage. Battery packs are widely used in our daily lives, such as television remote controls and electronic toys, In flashlights, there are series connected battery packs. Precautions: In battery packs, differences between individual units always exist. Taking capacity as an example, the differences never tend to disappear, but gradually deteriorate. When the same current flows through the pack, relatively speaking, those with large capacity always experience low current shallow charging and discharging, slow capacity decay, and longer lifespan, while those with small capacity always experience high current overcharging and discharging, accelerated capacity decay, and shortened lifespan, The difference in performance parameters between the two is becoming increasingly significant, forming a positive feedback characteristic, leading to early failure of small capacity and shortened group life
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