Quite fast, there are some negative reactions during the charging process, such as increased resistance in the battery leading to increased heat. Because the current in the fast charge is larger than that in the ordinary charge, the heat is more likely to accumulate, causing the battery to heat up quickly. And this heat is hot, is what we call \"hurt the battery\" intuitive performance. We all know that the working principle of electric vehicle fast charge and slow charge is not the same, fast charge is mainly charged with DC voltage, in this case, DC voltage is greater than the actual battery voltage, a large number of current ions will also flow from the positive electrode to the negative electrode at a very fast and very efficient speed, so as to complete the process of fast charge. That is, in the case of long-term fast charge, the actual battery voltage is very high, in such a high voltage state, will certainly be affected.
Electric bicycles in the use of fast charging mode, the charging speed is really fast, can save half the time than conventional charging. However, such a fast charging method is in exchange for the shortening of the battery life, so this method is not advisable.