Comment Re:Why can't they put a simple FET in there (Score 1) 111
Lenovo Thinkpad's have expensive batteries that allow for fine-grained control of these charging ranges. It can maintain it automatically, or you can set custom thresholds. i.e charge if below x%, stop charging at y%. This allows you to do things like commute back and forth from work without the constant 99% -> 100% charge cycle. Otherwise you lose a bit of charge on your commute and plugin at work/home inducing another cycle.