Firstly, you need to check the "electric eye" of the battery and judge whether it is good or bad based on the description of the electric eye. Generally speaking, green is good, red is bad, and white or black means that it needs to be charged or electrolyte added. This depends on the color of the density ball of the electric eye, which is generally stated in the instructions. Secondly, it is necessary to charge the battery. Generally, a one-time charge of about 8 hours can restore to about 80% of the capacity of the new battery, and it can be used again. 3. If the battery still cannot ignite after charging, you need to use a detector. Generally, if the discharge voltage does not reach 8 volts during continuous discharge for about 5 seconds, it indicates that there is a problem with the battery, as you are a newly charged battery and there is no shortage of power. 4. Next, use a discharge meter to continue monitoring. Open the single cell of the battery and press the discharge button. If any single cell shows continuous bubbles, that cell is damaged and recorded. 5. Then use a density meter to test the density of each cell. If the density of any cell differs significantly from other cells, that cell is damaged, and in both cases, the cell needs to be replaced
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