We bought 2 of these and although it has only been a few hours since they were delivered, they both work great. Too soon for battery review. These were to replace some that were very similar in specs, but were worn out. Both look and work like new.UPDATE: One went dead without warning after 2 weeks. Was able to reboot after several minutes and going through the setup menu for some reason. No data lost. Problem continued.2nd UPDATE: Amazon replaced the bad one. Replacement is working fine after one day.