According to theory, lead-acid batteries need to check the density of the electrolyte and the height of the liquid level at each time of maintenance, if there is a lack of need to add distilled water.

按照理论上说，铅酸蓄电池需要在每次保养时检查电解液的密度和液面高度，如果有缺少需添加蒸馏水。

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Electrolyte was one of the key points which made rechargeable lithium ion batteries with high power and energy density, long cycling life and desirable safety.

电解质是制备高功率密度和高能量密度、长循环寿命和安全性能良好的锂离子电池的关键材料之一。

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One of the critical techniques is to study and develop new high energy density electrolyte materials.

而高性能电解质材料的研究与开发是锂离子二次电池的关键技术之一。

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