About the BTI AC Adapter
BTI 0B46994-BTI 20V 90W AC ADAPTER COMPATIBLE WITH 0B46994, 0B46999, 0B47003, 0B47007, 45N0244, 45N0251, 0B46996, 0B47000, 0B47004, 0B47008, 45N0246, 45N0252, 0B46997, 0B47001, 0B47005, 0B47009, 45N0248, 0B46998, 0B47002, 0B47006, 45N0242, 45N0250, THINKPAD E431BTI 0B46994-BTI 20V 90W AC ADAPTER COMPATIBLE WITH 0B46994, 0B46999, 0B47003, 0B47007, 45N0244, 45N0251, 0B46996, 0B47000, 0B47004, 0B47008, 45N0246, 45N0252, 0B46997, 0B47001, 0B47005, 0B47009, 45N0248, 0B46998, 0B47002, 0B47006, 45N0242, 45N0250, THINKPAD E431