The cap of the Cadillac xts battery can not be opened. If you want to open it, you need to use a tool to destroy the lid. Most cars and electric cars use batteries that are basically maintenance-free, meaning you can't open the cap.
Many of today's batteries are maintenance-free, meaning they don't need to be filled with water. If the battery life declines, it is generally caused by battery aging. For this type of battery, you can only choose to replace it, and it cannot be repaired with water.
In general, adding water to the electric vehicle battery, according to the test without charging the drum, can restore 60% of the effect of the battery, but this state can only be maintained for a short few months, or even a few weeks, and it cannot fundamentally solve the problem of declining battery life. In addition, it needs to be said that if the amount of water added is not sure, it will directly damage the battery, resulting in the battery being scrapped.
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In addition, there is also a point to say that if the battery has been charged, then when the user chooses to add water to the battery, it will not have any effect. Therefore, for the battery filled with drum, the use of water can not be repaired, can only choose to replace.