Why does it take longer for the last 10-20% of a (EV) battery to charge compared to the bottom ranges?
In: Engineering
Think of a lithium battery (used in EVs) as having a spring-like nature. When you charge it you can quickly get it up to full but if you take it off the charger it will spring back to only 80% full. Doing the last bit of charging is basically slowly letting the spring relax until the battery is 100% *and* the spring will not bounce back.
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