Editorial Review:

Product Description:
Stay unplugged longer. Get twice the capacity of the 4-cell system battery and up to 7.5 hours of battery life on select systems. This high capacity battery has a notched design to accommodate tablet screen swivel hinge for notebook or convertible tablet function and fits in the standard ThinkPad X41 Tablet Series system battery slot. Its compatible design allows it to be in the system when the system is connected to the optional ThinkPad X4 Dock.

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Rating: - Worth the money but I still wish it were cheaper
It's a little bulky but the amount of power it adds when I am on the road is priceless. My XP-41 tablet is constantly optimizing for power so the result is I have never run out of juice, even when I set my screen brightness at 100%. I also added an ultra base battery I found at Overstock (Manufacturer Part Number: 92P1006) so I can get up to 11 hours of power. Considering that my travel day can last up to 30 hours, this is a luxury! I keep my 4-cell as a handy backup. When you travel as much as I do, you can't have too much power.

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Rating: - Quickly became useless
My experience with this battery was not as good as the first reviewer. Initially, it gave me 4-6 hours of continuous work. I was able to give a 2.5 hour lecture on one charge, easily. Slowly, the battery started deteriorating and after 10 months the work time was down to one hour.

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Rating: - Bulky but great power boost
This battery, new, is giving me 5-6 hours per charge. The 4-cell it replaced gave about 1.5 so I am happy. If you use it bear in mind that it sticks out an inch and a half beyond the edge of the laptop whereas the 4-cell is flush. It is also quite heavy so it detracts from the nice slim and portable nature of the X41.