How to do a Power-Cycle / Reset of a Dual battery Lenovo Laptop (eg. T440 / T440s) - YouTube
User manual Lenovo ThinkPad T400 (English - 188 pages)
ThinkPad X230 bad battery. Do you suggest battery gauge reset? Which app do you use for system/battery monitoring and settings? is Lenovo Vantage good? : r/thinkpad
How to change battery lenovo thinkpad T400 - YouTube
IBM / Lenovo 42T4547 - 37Whr 14.4V 4-Cell Lithium-Ion Replacement Battery for Lenovo ThinkPad T61, R61, T400, R400 Laptops - CPU Medics
Repairing / Unlocking Lenovo T400, T60, T61 batteries 42T5262 – Laptop Battery Chip Reset, Reprogram and Repair – Laptop Battery Analyzer and Repair Forum
Lenovo ThinkPad T400 2767 Battery (4 Cells)
Who Knew Thinkpad Batteries Require A Jump Start? | Hackaday