Introduction
How to replace the battery of a Lenovo Y50-70 laptop. The images and information in this guide were taken from this computer's service manual.
Tools
Parts
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            Remove the short (M2.0 × 5.0 mm) screws. 
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            Remove the long (M2.0 × 5.0 mm) screws. 
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            When re-installing: Install the 3 longer screws and then install the 9 shorter screws. 
 
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            Unplug the battery connector in the direction shown by arrow. 
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            Remove the M2.5 × 5.0 mm screws. 
 
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                            Conclusion
                          
                          To replace the battery & reassemble your device, follow these instructions in reverse order.