Instruct: Classify Amazon reviews into positive or negative sentiment
Query: updated review: dead after 6 months

UPDATED REVIEW: after six months of light use this battery doesn't hold any useful charge. I have another one of these extended batteries (which I use in a very similar way) which, after three years, still works very well and gives more than 4 hours of use. My guess is that Sony made a large batch and they have been sat in storage somewhere. So I have wasted my money with this second one!! ORIGINAL REVIEW: Came half charged, works fine with SZ61MN/B (European version of the US SZ600), about 4.5 hours run time with everything running full tilt (max. brightness, wifi connected etc.). Be careful if you have a Vaio and are looking for an extended battery, there are some sites which suggest that the VGP-BPL2 battery will fit the SZ6 laptops - it won't physically fit - you do need this VGP-BPL9.