Battery Type: Li-ion Voltage:14.8V Capacity:47Wh/3180mAh 4Cells Replace Part Number: ASM P/N 45N1070, PRU P/N 45N1071, 4ICP4/51/95 Compatible with Laptop Models: (use "Ctrl+F" to find your model quickly) Thinkpad X1 Carbon(3443) Thinkpad X1 Carbon(3444) Thinkpad X1 Carbon(3448) Thinkpad X1 Carbon(3460) Thinkpad X1 Carbon(3462) Thinkpad X1 Carbon(3463) For the new battery , we suggest that all of our customer should full charge it by AC power adapter ,because takes a long period, the capacity was strain out by inner PCB circuit, in order to protect your battery life,you can full charge to 100% and drain to 1% 2 times,then the capacity will recover.