开放式蓄电池相对便宜，但维护工作量较大。
Vented batteries are less expensive, but require more maintenance.
对废旧银锌钮扣电池中的银含量进行了检测，结果显示总合银量在20％-35％之间；
Tests on silver in wasted button cell show there are 20-35% of silver in button Cell.
费用是指状态量的电能放在一个电池。
State of Charge refers to the amount of electrical energy left in a battery.
费用是指状态量的电能放在一个电池。
State of Charge refers to the amount of electrical energy left in a battery.
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