Thank you for the link. I haven't used this site. Being in Japan I did find this site
https://www.rowa.co.jp/cabinet/product_list.cgi?F=&cat_select=%A5%A2%A5%C3%A5%D7%A5%EB&topdis=&key=&grp=&ganre=%A5%CE%A1%BC%A5%C8%A5%D1%A5%BD%A5%B3%A5%F3%A5%D0%A5%C3%A5%C6%A5%EA%A1%BC
where it seems batteries are made in China (maybe to order? ) but then how safe are they (based on replica Apple iPhone chargers blowing up in the past)?