Lithium battery 20 series and 21 series have a big difference, first from the voltage, the voltage of 20 series lithium battery is 3.7V, while the voltage of 21 series lithium battery is 4.2V, high voltage also means that the power is larger, can support a larger load. In addition, the capacity of 20-series lithium batteries is larger, generally 10% higher than that of 21-series lithium batteries, and 21-series lithium batteries charge faster, which can meet the needs of users faster. In general, 20-series lithium batteries can meet the needs of large capacity, while 21-series lithium batteries can meet the needs of fast charging.
The 20-string voltage of the lithium battery is 72v, and the 21-string can be counted as 76v.
The string here is in series, which increases the voltage value.
After adding 1 series, the corresponding lithium battery protection board should also be changed from 20 strings to 21 strings, and each string of lithium batteries should be protected.
Of course, the 21 series is better. The voltage is high, the total capacity is also much, and the motor is strong. The voltage of lithium battery 20 series is 24v, and the voltage of 21 series is 25.2v, the difference between the two is that the electromotive force is different.
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Ternary lithium 20 series is used for 72V electric vehicles, and 21 series is larger than 20 series current and voltage.
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From the point of view of the battery, the less the better, to reduce the impact of individual differences, 20 series and 21 series is not only the difference in voltage, but also increase the individual difference.