The NP-FZ100 battery is used in three of Sony’s best cameras: a7 III, a7r III, and a9. It seems likely that future Sony cameras will use this battery as well. ProMaster’s NP-FZ100 Battery (1970) is an excellent replacement which is fully compatible with all three cameras. The 2,000 mAh rating is a true and honest capacity. The premium lithium ion cells will yield years of excellent service.
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