After the batteries are connected in series, the voltage increases as the number of batteries increases, but it does not increase its output current, so the capacity remains unchanged. If you want to increase the output current, you can connect the batteries in parallel, so the capacity of the batteries will increase.
For example, connect 4pcs 12V100AH Improve Lifepo4 batteries in series, you can get 48V100AH; connect 4pcs 12V100AH Improve Lifepo4 batteries in parallel, you can get 12V400AH.
The battery is connected in series, the voltage is increased, and the capacity remains unchanged.
The batteries are connected in parallel to increase the capacity and the voltage remains unchanged.
Regardless of whether the batteries are connected in parallel or in series, the total power remains the same.
For example: Electric vehicles originally used 12V batteries and traveled at 10 km/h. If you use 4 identical batteries in series, you can get a 48V battery. At this time, the speed can reach 40 kilometers per hour, but after running for an hour, the battery will run out, which means the total distance is 40 kilometers. If 4 batteries are connected in parallel, the voltage is still 12V, the speed is still 10 km/h, but it can run for 4 hours, and the total distance is also 40 km.
When connecting in series/parallel, you must use batteries with the same voltage and the same capacity. If the voltage or capacity is different, the battery will be charged and discharged unevenly, and the batteries with low voltage and small capacity will be scrapped in advance.