Which is why [Alexander Parent] decided to take the road less traveled and scratch built a custom battery for his ThinkPad T420. By reverse engineering how the battery pack communicated with the ...

For most people, a battery pack ... on their ThinkPad battery — back in 2020, we covered [Alexander Parent]’s efforts to create an open source battery pack for the T420 based on the ATtiny85.

With its redesign of the popular ThinkPad ... battery life juggernaut that it once was. But when it comes to battery life, with the Gen 9 update, the X1 Carbon is back. For the ninth-gen model ...