離港一個月, 唔想汽車無電, 係咪應該拆走舊電? 或者唔接駁電池?

只要的把電池的負極輸電線拆掉，這樣就可以停止車內大部分的待機功能的耗電，讓電池只有自然放電狀態，而這種狀態的放電量是很少的

You should do nothing. Instead, you should prepare for jump start.

The car battery is going to drain, regardless what you do about it. It is only a matter of how fast, depending on the condition of the battery. It is possible that the battery can handle months of non-usage. It is also possible that the battery can't handle even 1 day.

Doing anything with the battery can actually cause more troubles than you imagine.