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APPROACH WITH CARE AND CAUTION. Don't break your laptop! And don't blame me if you do. If in doubt, go to a professional.
How to change or upgrade the hard disk or access the RAM and bios battery on a Lenovo B50-50 (Model 80S2) laptop.
The procedure takes at least 16 minutes, probably longer if you are new to opening up laptops. This video shows you how to remove the keyboard, battery connection and lower cover to access the motherboard, hard disk, bios battery and RAM.
This is the first mainstream PC I've come across that doesn't have a user changeable or removable battery!