Just passing on my experience with a Chinese battery. Had it about a month had 2 whole cycles on it. Machine was off, removed it from the dock, tried to boot, the TP splashscreen showed then machine turns off

Removed the batt - boots fine, with 8 cell - boots fine, with 4 cell no boot.
This was a 4 cell I paid 30 american dollars for so I took the chance

now I go ahead and buy a real battery. Lesson learned stiff upper lip old chap, pip pip and all that sort of rot!
Luckily I still have my new Lenovo 8 cell, from the recall thing, and will not boycott Chinese food either.