Lenovo IdeaPad Y550P - Manual (Page 112)

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Appendix C. Specifications
Power source
(AC adapter)
ƒ Input rating of the AC adapter: 100-240 V ac, 50 to 60 Hz
ƒ
90 W
Note:
For models with discrete graphics card, the supplied
90 W AC adapter with the unit is recommended.
Otherwise, it will cause AC adapter overheating or
machine malfunction.
Battery
pack ƒ Lithium-ion (Li-Ion) battery pack
– Nominal voltage: 19 V dc
– Capacity: 56-57 Wh