Power Connector

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Over time, different ThinkPads have used different power connectors. You can use a higher Amperage rated power supply then your ThinkPad needs, as long as the physical connector is correct. But you should not use a lower Amperage power supply on a ThinkPad needing more Amperage. Doing so will overheat the power supply, and might cause issues such as screen flicker.

Hint:
In case you cannot find your Model ThinkPad listed, or you wish to double check, you can find the required power information on a label on the bottom of your ThinkPad
NOTE!
The Amperage's listed below are the OUTPUT values for the AC adapter, which should be equal or greater then what your ThinkPad requires

All current Thinkpads require 20 Volt DC input. See also the official Lenovo page for power adapters.

10.5 V, 1.0 A Power

15 V, 2.0 A Power

4-Pin connector

4 pin power connector

Unknown watts/amps

35W

AC Adapter PN 76H0119

40W

56W

AC Adapter PN 12J2456

16 Volt 4-Pin Power Mini-Din connector

120W power plug

120W 7.5 Amps

ThinkPad 120W AC Adapter (Support Website)
AC Adapter FRU PN 92P1035
AC Adapter Ouput: 7.5A, 16V

16 Volt Coax connector

16V coax connector

This is a 2.5/5.5mm barrel connector

35W 2.2 Amps

AC Adapter input: 1.9A, 35W
AC Adapter output: 2.2A, 16V

54W 3.36 Amps

Some of them have been recalled: part 02K6549 (FRU 02K6550), with three hollow pins. (CPSC recall) (Lenovo document) See the page Damage in 56W AC-Adapter, plastic housing melted.

56W 3.5 Amps

AC Adapter FRU PN 02K6810, 02K6816

72W 4.5 Amps

AC Adapter FRU PN 02K6744, 08K8202

90W 5.6 Amps

Help needed
Is this for real?

19 Volt Coax connector

45W 2.4 Amps. 5.5 mm outer, 2.1 mm inner diameter. Marketing number 11J8702. FRU 02K6900, 11J8627, 12J0539.

20 Volt Coax connector

20V coax connector

7.5mm OD, 0.8mm diameter central pin

65W 3.25 Amps

AC Adapter FRU PN 92P1211
AC Adapter Output 3.25A, 20V

90W 4.5 Amps

AC Adapter FRU PN 92P1107

135W 6.75 Amps

AC Adapter PN 55Y9317

170W 8.5 Amps for W700

AC Adapter PN 41R4421

The W700/W700ds AC adapter plug has a different diameter than all other 20 Volt AC adapters. You cannot plug in a different AC adapter into a W700-series Thinkpad nor can you use the W700 AC adapter on a non-W700 Thinkpad.

170W 8.5 Amps

AC Adapter PN 0A36227 (US) and PN 0A36231 (EU)

This AC adapter has the same diameter as the usual 20V AC adapters, but there is an extra plastic knob on one side of the connector. It is not round any more, that is, you can only plug it in one particular orientation. The extra knob prevents one from using the AC adapter on any other Thinkpads.

230W 11.5 Amps

AC Adapter PN 55Y9333