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Lenovo IdeaPad S540-13API 5V/9V/12V/15V/20V Laptop Car Charger / 65W Car adapter - Auto power supply
AJP New Replacement For Lenovo ideapad S540-14API, S540-15IWL, S540-14IWL Laptop Tablet Adapter 45W Battery Charger Power Supply Unit 4.0MM x 1.7MM UK Wall Plug PSU Adaptor 20V 2.25A: Amazon.co.uk: Computers & Accessories
Charger Green Cell PRO 20V 3.25A 65W for Lenovo (Slim Tip)