Gigaset is a German company who manufactures and assembles in Germany. https://www.gigaset.com/hq_en/smartphones/ A German remarkting firm Volla sells them with their own Android. The swiss company Rephone also rebrands with upgrads the GS5 (6GB RAM instead of 4).

All the recent Gigaset phones have replaceable Batteries. I use a GS5 and a Rephone with SailfishOs.