Silvercrest SURB 520 A1 - Manual (Page 15)

Power Bank SUPB 520 A1
14 - English
Operation
Inserting the Rechargeable Battery
To insert the rechargeable battery, proceed as follows:
The battery compartment is located on the bottom of the Power Bank. First
remove the rubber wedge, then insert the rechargeable battery. The battery
can be inserted in one direction only.