Hi,
I just found on ebay lot of 35 this type brand new batteries.
Owner had by mistake NUBA6L description, but he confirmed that as on picture he have NUBA1 batteries. He already corrected topic and (partially) description. Hope someone will grab them and will be helpfull.
https://www.ebay.com/itm/126216121049?itmmeta=01HQ9C09QRX7E444TFFKXQH505&hash=item1d63112ad9:g:8UUAAOSwN6Vlai7B