The fast external charger can be used to charge extra batteries while using the camera.
The Ricoh BJ-11 Battery Charger provides fast charging for the DB-110 battery. This charger allows you to charge one battery without using either the Ricoh GR III or WG-6 digital cameras. Its small and compact size makes the BJ-11 perfect for travel. In addition to the charger, you will get 2 extra Ricoh DB-110 3.6V, 1350mAh Rechargeable Li-Ion Batteries which serves as a spare or replacement for the one provided with the camera.