求翻译：在上世纪，铅酸电池几乎没有什么变化，最后一次主要改进是对其进行密封。真正改变的是对它的需求。起初，电池仅仅用于发动汽车、鸣喇叭和为车灯供电。如今，在点火之前，汽车的所有电气系统都要靠它供电。是什么意思？

In the last century, lead-acid battery is almost no change in the last major improvements to its sealed. The real change is the demand for it. Initially, the battery is only used to start the car, honking and as the lamp power supply. Now, in the ignition before the car's electrical system should be

In the last century, lead-acid battery almost no change, and the last major improvements is