My 9 years old X220 has been running for 2 hours of light use. Its battery status indicates about 3:45 hours left. This admittedly is with the 9 cell battery, b

My 9 years old X220 has been running for 2 hours of light use. Its battery status indicates about 3:45 hours left. This admittedly is with the 9 cell battery, but still rather good for a second hand laptop I bought four years ago...