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The GR IV uses a new cell (DB-120) and the BJ-12 charger - the older DB-110 won't fit it. Sells out often, and Amazon dropped the genuine listing, so this one goes straight to B&H.
Same rule as the DB-110: buy genuine. The IV's cell is bigger (1800 mAh, roughly 250 shots) and charges in-camera over USB-C in about two hours, or in the BJ-12 dual charger. Supply has been tight ever since the GR IV launched, so if you see it in stock, that is the moment.
Compatibility
GR IV
GR IVGR IV HDFGR IV Monochrome
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