The pressure loss caused the increase in exhaust back pressure, leading to the decrease in chargeefficiency.
压力损失使发动机的排气背压升高，引起充气效率下降；
2
It is also discussed how to prolong the lifetime of the battery, to raise the chargeefficiency, to save electrical energy and so on.
并就如何延长电池使用寿命，提高充电效能，节约电能等问题进行了讨论。
3
Comparatively, the former has relatively higher chargeefficiency, so it is frequently used in the technology of high voltage and large current discharge.