This is one of the best purchases you can make to refurbish or liven up your thinkpad. Open up command prompt and type "powercfg /batteryreport" to find the state of your current batteries. My used thinkpad had batteries had only 70% of capacity remaining. I was suspicious that this battery was going to be refurbished, and was pleasantly surprised that this amazon battery is at 100% of capacity. While the permanent battery is still terrible, this replacement unit has picked up all the slack to get through a day's work. I am getting a genuine 6+ hour battery life thanks to this unit. If you're considering upgrading out of your thinkpad I would highly recommend this battery, an SSD, and additional ram. These laptops are beasts and don't need much to keep going.
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