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I'm also using an X220. I bought an X1 as a potential replacement but the trackpoint is unusable and the keyboard is a big step down. The X220 battery only lasts about 15 minutes though, so I need to keep it plugged in. I'd like to find a replacement battery but am not enthusiastic about prying the housing apart to install new cells or buying a knockoff from a faraway land which might start a fire.

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The easiest way to tell the difference between a real and fake is by the white "recycle" sticker

https://preview.redd.it/83f0fqegasa11.jpg?width=1263&format=...

fake batteries have a poorly printed, "fat" looking battery on the recycle sticker and the real ones have a slender properly printed one. For context in the image the bottom one is fake.

Thanks, but the problem is that either it has the original cells inside and those will have the same issues as my current ones or it has new (possibly unmatched?) cells of unknown provenance.

I've stared at the image for 3 minutes and still can't figure out the difference. Where exactly is the "fat looking battery" you refer to?

It looks like it is inside the white circular recycling symbol - not the other triangular recycling symbol.

Aha, that cleared up my confusion! Thanks.

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