I know that charging the battery too fast can overheat the battery and shorten battery life. But is charging it slowly, e.g. from a USB 2.0 cable plugged to a laptop, also harmful for the battery? I know there is a 'USB charging mode' designed for this, but I am not so sure if it is bad for the battery.

I have Googled, but most links are forums where people offer their opinions and personal experiences, I want to know whether someone has actually tested this out?

1 Answer 1


Slow charging is great for a lithium battery. Two things kills lithium batteries

  1. Temperature
  2. Charge level

    • Charging too fast causes excess heat, that damages lithium batteries
    • Keeping your battery charge too high also damages lithium batteries

Ideally you want to slowly recharge and keep it between 20% - 80%. Also, many short small charge cycles is better than a lengthy large charge cycle.

Sources: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

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