I'm very dissapointed with Lenovo's product quality. I tried to open the back cover of my U400 and it didn't go very well. I followed the instructions exactly as mentioned on the official videos, taking every single step carefully. However, it's impossible to remove the bottom cover without breaking the plastic tabs. I have yet to hear from someone who has managed to do flawleslly.
Anyway, besides this, the battery life is nowhere near 7 hours as Lenovo claims. I can get maybe 4 tops if the screen brightness is turned all the way down, no apps runnig, and wifi radio and bluetooth turned off.
I haven't changed any internal components or anything. Would Lenovo accept this return?