Which extra battery for X61? how much? and where to buy it?

[kennyschiff]

I currently have an 8-cell battery purchased bundled with my x61. I want to buy a spare. I understand the difference between the 4-cell and 8, but don't understand the difference between the "enhanced."

Also, where's a good place to buy extra batteries?

[JonathanGennick]

There are two four-cell batteries for the X60 series. The so-called slim-line battery (part # 40Y6999) works only with the two s-models: X60s and X61s.

The other four-cell is called "enhanced" (part #40Y7001) fits all the X-series models, and I think holds a bit more of a charge.

If you do not have an s-model, then your only choice for a four-cell battery is the 40Y7001.

BTW, I would buy from Lenovo. I am generally too nervous of (or respectful of) Lithium batteries to buy third-party. But if I had to buy third-party, I'd start with BTI at batterytech.com.