求翻译：(4)能量效率。电池作为能量储能器，充电时把电能转变成化学能储存起来，放电时把电能释放出来。在这个可逆的电化学转换过程中，有一定的能量损耗。通常用电池的能量效率来表示电池的充放电效率。它表示为放电时输出的能量与充电时输入的能量比。电池内阻是影响能量效率的主要原因，它使电池能量以热的形式损耗掉。是什么意思？

(4) energy efficiency. Battery as energy storage devices, charging the electrical energy into chemical energy stored discharge energy released. The reversible electrochemical conversion process, a certain energy loss. Usually the energy efficiency of the battery to the battery charge and discharge e

(4) energy efficiency. Batteries as energy accumulator, the charge is converted into chemical energy to electrical energy storage, the discharge of energy is released. In the reversible electrochemical conversion process, there is a certain amount of energy loss. Usually the battery to the energy ef

(4) energy efficiency.The battery took energy energy storer, when charge transforms the electrical energy the chemical energy to store up, when electric discharge releases the electrical energy.In this reversible electrochemistry switching process, has certain energy loss.Usually uses electricity th

(4) energy efficiency. Batteries as an energy storage device, charging turn electrical energy into chemical energy stored up and discharge electricity when released. In this reversible electrochemical conversion process, there is a certain amount of energy loss. Is usually represented by the energy