Lenovo power supply

Question

I have two Lenovo laptops and I can't remember which power supply adapter goes to which. One power adapter output is 20V and 2.25 amps, the other is 20V and 3.25 amps. If I were to switch the power adapters, how much trouble might it cause?

Solution

I have long experience with IBM and Lenovo laptops.

You can use any genuine Lenovo adapter with any Lenovo laptop with same socket with no damage to laptop or power supply. In Lenovo - if you can plug it in - it will work.

If you have powerful laptop (with dedicated GPU and fast CPU) - you may be not able to charge battery with 45W charger (2.25A) when laptop is turned on.

Here is lenovo shop link to 45W (2.25A) adapter: link

Page under that link says:

ThinkPad 45W AC Adapter (Slim Tip)

• Compatible with ThinkPad Helix, T4301s, and 2013 Lenovo notebooks with slim common power plug
• Not compatible with legacy notebook systems with the round, barrel-type power plug

Comments

[tvdo]

The expected voltage and current should be labelled on the laptops too. And you also have to watch the polarity. Your assumption in the comment is correct - more supply current won't do anything (the required current is pulled by the load, and no more), but a lower supply current than required can lead to overheating of the supply.

[Thalys]

From experience, any lenovo power supply with the right tips work - there's usually a 'regular'/travel varient and a 'quickcharge' varient, both of which work with the same models and differ with size. There also seem to be official 'standard' to 'slim' tip converters as well. So yeah, this seems tight