汽車電池?

汽車電池 is made of lead acid, it is a high capacity lead acid battery, mostly use H2S04 hycloric acid to use as it's catalyst. And the acid is mixed with distilled water.

since it use acid as electrolyte, it is 酸性


Battery Power and Uses
In any battery, the same sort of electrochemical reaction occurs so that electrons move from one pole to the other. The actual metals and electrolytes used control the voltage of the battery -- each different reaction has a characteristic voltage. For example, here's what happens in one cell of a car's lead-acid battery:
The cell has one plate made of lead and another plate made of lead dioxide, with a strong sulfuric acid electrolyte in which the plates are immersed.

Lead combines with SO4 to create PbSO4 plus one electron.

Lead dioxide, hydrogen ions and SO4 ions, plus electrons from the lead plate, create PbSO4 and water on the lead dioxide plate.

As the battery discharges, both plates build up PbSO4 (lead sulfate), and water builds up in the acid. The characteristic voltage is about 2 volts per cell, so by combining six cells you get a 12-volt battery.
A lead-acid battery has a nice feature -- the reaction is completely reversible. If you apply current to the battery at the right voltage, lead and lead dioxide form again on the plates so you can reuse the battery over and over. In a zinc-carbon battery, there is no easy way to reverse the reaction because there is no easy way to get hydrogen gas back into the electrolyte.


私家車及客貨車是12v,而輕型貨車以上是24v,近年大部份車都會用環保電,因為不用check電池水,而電池上的顏色亦清楚顯示電池的壽命~

純度只是一般, 因為純度太高的鉛硬度不夠, 容易爛.