双登旧电池拆卸：先拆负极，再拆正极。先拆负极是为了安全：因为电路结构的因素，负级是接在车身上的。如果先拆正级，有可能正级会碰到车身的其他部位造成短路，即使端子没有这么长接触不到车身，但在拆卸的时候，用维修工具的时候会碰到车身，一样会造成蓄电池短路。蓄电池短路十分的危险，轻者会造成蓄电池短路损坏，严重的话会引发汽车起火，后果不堪设想。

安装：先装正极，再装负极。装的时候先装蓄电池正级也是一样的，也是为了安全，蓄电池正极装上了去了就不会乱动了，因为蓄电池的负极与车身都为负极，即使接触到了也不会短路，而负极恰恰是要与车身连接的。

Disassembly of shuangdeng old battery: first remove the negative electrode, then remove the positive electrode.First remove the negative electrode for safety: because of the circuit structure, the negative stage is connected to the car.If the first disassembly level, it is possible that the positive level will encounter other parts of the body causing a short circuit, even if the terminal is not so long contact less than the body, but in the disassembly, when using maintenance tools will encounter the body, the same will cause battery short circuit.Battery short circuit is very dangerous, light will cause battery short circuit damage, serious words will cause the car fire, the consequences are unimaginable.

Installation: install positive pole first, install negative pole again.When installing battery positive level is the same, but also for safety, battery positive pole installed to go will not move, because the battery negative pole and body are negative, even contact will not short circuit, and the negative pole is to connect with the body.