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    In fact, not only 18650 batteries, but other types of batteries, even those of the same size, will have different capacities. This is related to the manufacturing process and utilization of materials in batteries. There are differences in manufacturing costs for batteries with different capacities, which can lead to differences in selling prices. When choosing a battery, it is necessary to make a decision based on factors such as actual capacity requirements and costs.

    Indeed, different capacities may be achieved through parallel connection of batteries. However, in situations where space is fixed, it is necessary to consider choosing batteries of different capacities. Some require the use of larger capacities, while others only provide power supply with low requirements for capacity and other parameters. In fact, besides the differences in rated voltage and capacity, another important parameter of 18650 lithium batteries is the discharge rate. This parameter determines the long-term and instantaneous output current of the battery, so 18650 batteries are usually divided into capacity and energy types. The focus of capacity type batteries is on their capacity, and some may be used in situations where they discharge light and low current for a long time; Energy batteries require instantaneous or continuous discharge current, and are occasionally used in situations with high operating currents, such as power tools, etc.

    So the important aspect of batteries of the same size exhibiting different capacities is the manufacturing cost. Considering this issue, it is necessary to make a fair decision based on the actual situation. As for the 5500mA H and 9800mA mentioned in the question

    H. A battery with a capacity of 12500mAh or the like is not practical for a single 18650 battery. These batteries belong to the category of capacity inflated batteries. To achieve this capacity, it is necessary to use the method of parallel connection of multiple batteries.

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