I buy an used notebook (Sony Vaio SVF152C29X), its only defect is that it doesn't charge the battery, it only works plugged in the power supply (19.5V and 6.2A output).
I don't know if the battery doesn't charge because it's dead or if it is a notebook defect.
I used a multimeter (in DCV position) to measure the output in the notebook terminal (where I plug the battery) and it shows 19V. But the battery specification is 14.8V/2670mAh/40W (it is a Sony VGP-BPS35A).
Is there something wrong with the notebook or it do exists batteries 14.8V that charges with 19V voltage? Or the battery can have a smaller transformer inside it?