The CMOS battery on the Y550 is considered to be non-replaceable by Lenovo. It is soldered directly to the motherboard itself. You can check out this youtube video on the disassembly of the Y550. At the 14:22 minute mark on the video you can see where this battery is. At the top right of the video you will see a big green INTEL chip (upside down). To the right of the bottom of the Intel chip, you will see a round blue component. This is the battery.
If you were handy with a soldering iron, you could un-solder and replace this battery, but the average consumer would not be able to replace it. Lenovo will most likely require you to purchase a new motherboard.
Here is a better look at the battery from an ebay listing:
http://www.ebay.com/itm/OEM-LENOVO-IDEAPAD-Y550-INTEL-MOTHERBOARD-mPGA478MN-SOCKET-KIWB1-LA-4602P-/171885234728?hash=item2805288a28
In this picture the battery is the blue round button looking component to the left of the Intel chip.
tnk u so much .. but personally wud u go fora lenovo or an hp ?
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