The battery comes with a tutorial to reset the SMC and 3 screwdrivers for disassembly. The battery cycle shows 0 for installation. The displayed range is between 5 and 6 hours. Using Google Chrome so this may vary depending on applications ...
Clearly, it changes compared to my original battery holding just 1 hour. You have to see what happens in six months to see if it is worth the money or not. For now I'm a satisfied customer.