In this case, [Mika] wanted to resurrect the battery from his IBM Thinkpad T40. He identified the offending cell and replaced it, but couldn’t get any juice out of the battery after the repair.

Looking for the laptop with the longest battery life? It's not a MacBook anymore — it's the ThinkPad T14s Gen 6.

The Lenovo Thinkpad T14s Gen 6 is a long-lasting, Snapdragon-powered ThinkPad that shines in battery life and portability ...

But when it comes to battery life, with the Gen 9 update, the X1 Carbon is back. For the ninth-gen model, Lenovo has restored the notebook’s 57 WHr battery capacity, up from 51 WHr battery used ...