[zhddz]

I think for lithium battery, I can only charge it for certain number of times.
That's why I saw many people recommended to fully charge the battery every time.

But every time I transfer data through USB, the reader charges itself at the same time. I think the reader doesn't know whether I am transfering data or I am charging the battery. Will transfering data affect my battery life significantly? Should I wait the battery to be fully charged every time transfering data? To prolong my battery life, maybe I should use Wifi to transfer data?