Review on DTK Laptop Battery Replacement For Lenovo IBM Thinkpad - Upgrade Your L450, T440S, T450, And More by Adrian Garcia

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.