I came here to have three watches have their batteries replaced. It took 20 minutes to get done, so I walked around other shops while I waited. Very fast service. The cost is about 1000yen to 1500yen depending on your watch and its battery needs. I came with a Bulova, Seiko, and a Timex, totaling about 4500yen. It is slightly more than I am used to paying in America(a flat $ 10 for each, or about 1000yen) but it isn’t that much more. Sadly, they don’t accept credit cards for battery replacements.