Lenovo 57Y4186

Discounts Thinkpad Battery 55++ (9 Cell) These rechargeable batteries use Lithium-Ion (Li-Ion) technology and can be used as replacement for aging system batteries or as a convenient spare Lenovo 57Y4186 battery. Stay unplugged longer with ThinkPad Battery 55+ and ThinkPad Battery 55++ Battery Size: Proprietary Battery Size Height: 0.8", Width: 8.6", Depth: 3.1" ... More details »

Lenovo 57Y4186 Review: I had purchased the 6-cell battery along with my T420, and while it was light and portable, it wasn't enough to make it through the business day. I upgraded to this 9-cell and it gives between 7-10 hours of use depending on what I run, which means I can do a full business day without needing a plug nearby. And it doesn't add much to the size and weight (plus it also fits fine with my mini-dock). The 6-cell is now demoted to backup battery. 1 ... Read more »

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