The battery is not original, it is a replacement. The finish is affected: the battery is not fully secured when fully locked in the pc. It gives the impression to get out alone in a collision (which is not supposed to come true, but enough to start the doubt). Otherwise, it is functional, well recognized by the PC which does not include, if like me your original battery was in critical condition, that you have put him in a new more efficient. Some hacks to do to fix the problem. Really now convenient to use my vaio without being subjected to the presence of close to taking the month of 20 minutes!
