If the battery still shows insufficient power after replacement, it may be caused by poor battery connection. Please check whether the positive and negative electrodes of the battery are firmly connected to ensure that there is no looseness and corrosion. Loose connection or corrosion will lead to poor current transmission and affect the normal operation of the battery. If poor connection is found, it can be cleaned and fastened with a wrench or battery terminal cleaner. In addition, you can check whether the battery terminal is damaged or corroded, and replace it in time if necessary.