How to test your Thinkpad X220 batteries using TLP. Please see all the links below for valuable Thinkpad battery information!

TLP:
http://linrunner.de/en/tlp/docs/tlp-l...

Lenovo Battery Recall (For X220)
https://pcsupport.lenovo.com/ca/en/so...

Lenovo 44, 44+ and 44++ Battery Spec Page
https://support.lenovo.com/ca/en/solu...

Lenovo Battery Firmware Update (Windows Only) (Some X220 Batteries Affected)
http://support.lenovo.com/ca/en/downl...

Lenovo Power Management and Other Utilities (Windows Only)
http://pcsupport.lenovo.com/ca/en/pro...