Some laptops with changable batteries have 4/6/9 cell variants. I know Lenovo has them in the 11-14v nominal (from my head) range, 4s/3s2p/3s3p, so the lower vo

Some laptops with changable batteries have 4/6/9 cell variants. I know Lenovo has them in the 11-14v nominal (from my head) range, 4s/3s2p/3s3p, so the lower voltage spec for the DC/DC converter might even be lower than 12v.