Since batteries can be recharged only slowly (the process takes hours, not minutes), a car's effective range is limited by the size of its battery. And batteries are expensive.
由于电池充电缓慢(这一过程耗时数小时，而不是几分钟)，因此汽车的有效行驶里程取决于电池的容量，而电池是很昂贵的。
Incidentally, you do not need to empty the battery before charging. Modern lithium phone batteries can be recharged however full they are.
顺便说一句。你没有必要等电池的电用光了再充电。不管有多满，锂离子电池都可以充电的。
Incidentally, you do not need to empty the battery before charging. Modern lithium phone batteries can be recharged however full they are.
顺便说一句。你没有必要等电池的电用光了再充电。不管有多满，锂离子电池都可以充电的。
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