TPE High Performance Laptop Battery for IBM Lenovo ThinkPad X300 X301 Series fits 43R9253 43R1965 43R1967 ASM 42T4519 ASM 42T4523 FRU 42T4518 FRU 42T4522 [11.1V 3600mAh 40Wh] Battery type: Li-ion; Capacity: 3600mAh/40Wh; Voltage:11.1V. Use the keyboard shortcuts Ctrl+F or -F (Mac) to quickly crosscheck if your requested model is listed in the following Compatible Laptop Model List or Compatible Parts Number List. Up to 500 cycles service life, low self-discharge, no memory effect; Dual IC chips provide protection against short circuit, over-discharge, overcurrent. CE/FCC/RoHS certified for product safety. Grade A Cell ensures fast charging and low power consumption; Operation time for standard batteries(6-Cell, 4400mAh) can reach approx. 2 hours, but the actual operation time depends on how much electricity is required on your device. TPE only deals with brand new premium replacement batteries. We only use the highest quality cells inside the battery pack so you will have a long service life. Our inventory turns rapidly and you will always receive a freshly manufactured battery.