Seems it does have a removable battery, as far as I remember they where not sure of it not long ago when reading but.... Maybe I either was misreading or they have changed it:
SHIFT6mq
6 inch Smartphone - regular price 844€
pre-order for 799 €
New modular design
6 inch FullHD+ AMOLED Display | 18:9 | Gorilla Glas 5
Dual rear camera (16 MP / 24 MP ), Video 4K
13 MP front camera,
SHIFT-OS (Android™ 10) | Custom-ROM-Support
Qualcomm® snapdragon 845
8 GB LPDDR4X RAM
128 GB int. storage ***, ext. up to 512 GB
4G LTE | Dual SIM: 2x nano, parallely usable
Battery 3850 mAh (removable) ***
76,4 mm x 159,8 mm
USB 3.0 Typ C, headphone jack ***
Wi-Fi, Bluetooth, GPS, NFC, Fingerprint sensor
Incl. 22 EUR device deposit
– – –
pre-order now! Delivery expected end of Q1 2020 *
Although not cheap for sure...