当白昼时，太阳能电池提供电流，又给化学电池再充电。

During the day, the solar batteries supply the current and also recharge the chemical batteries.

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但是即使是先进的动力系统和改善的锂离子电池，还是受到一次性充电电池的限制-他们再充电的时候需要耗费数小时。

But even with advances in power systems and improved lithium-ion batteries, their range on a single charge is limited-and recharging can take hours.

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当可再充电电池在垃圾中被降级时，重金属能污染周边的空气，表层土和地下水。最终进入人体。

When rechargeable batteries degrade in landfills, heavy metals can taint the surrounding air, topsoil and groundwater, eventually getting inside our bodies.

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