这种速度突增的动力来自一组电池，该电池组储有42千瓦小时的电能。
The power for these bursts of speed comes from a battery packet with a storage capacity of 42 kilowatt hours.
蓄电池组各个电池制造误差间的差异可能是第一种原因。
Small differences in the manufacturing tolerance of a battery's cells may play a part.
为了延长电池寿命，电池组不会完全充满，也不会完全耗尽。
To extend battery life, the pack never fully charges or depletes.
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