I recently came across someone who wishes to sell his DW-8400BK but according to his listing, the buyer would need to change the battery as the watch was stored away for a long time.
Does anyone know what type of battery is needed for the watch and is it widely available before? If it isn't, I might just have to find ways to purchase the battery in Japan. I can't ask him the seller directly as I can't read and write Japanese
Any advice is greatly appreciated.