I received this watch for my bday in June last year.  I charged it once (left it by my window for about 3 hours) and it still working.  Never lost time at all in the past 8 months now... Yay! No batteries needed!  I got 3 other watches that needed batteries and I haven't used them just because I don't have time to take them to the watch dealer.  I think I'm sold on the Seiko solar watch and I want to buy another one!  My only problem with this is that the face is a little small for my hand but at least, it's a white face so I could still see the time.  Also, this watch does not have a second hand. But it's still a good watch overall.