This Sony Vaio Laptop had a faulty main battery. The battery was not removable type and was internal one. The problem with Sony Vaio Laptops is that they tend not to accept any after-market batteries and even if you install non-Sony battery it does not work. We, therefore, ordered genuine Sony battery and installed it for the customer. This battery was original Sony one and held charge for more than 6 hours. The client praised us for a quick service.