I have broken up 5 Lenovo Battery packs.
Its important to look for Lenovo since they only bought out IBM in the past 5 years the packs are usually in good shape.
4 of the 5 Packs had Sanyo 2600mah with the light blue tops
the other had Sony Green US18650GR in them
I have had great luck with the laptop pack recovery game. Have only had to recycle 6 of the ~40 Sanyos recovered, and the Sony’s all charged up from just over 3V and are holding their charge just fine.
The 6 Sanyos that were recycled were between 2 and 2.5V. I don’t have a hobby charger yet so its easier for me to just recycle them.