Razer Blade OEM battery conked out just as my warranty died, and Razer wanted me to ship it to them for over 2 weeks. Instead I bought a battery from these guys and was able to install it myself (the cable was a bit tough to fit, but it just required some gentle persuasion)
Running powercfg /batteryreport tells me that the battery is running as expected. Happy with my purchase. Hope this one lasts longer!