Lenovo IdeaPad Y550P User Manual page 112

Appendix C. Specifications
Power source
(AC adapter)
Battery
pack
104
Input rating of the AC adapter: 100-240 V ac, 50 to 60 Hz
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.
Lithium-ion (Li-Ion) battery pack
– Nominal voltage: 19 V dc
– Capacity: 56-57 Wh