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“Compatible” describes whether it works. “Required” or “Useful” describes whether you should buy it.
DJI
DJI lists Battery Case 2 for Action 3 through Action 6 and documents three-battery charging.
Safety qualification: exact tier-1/2 manufacturer or certification evidence is linked, with no active conflicting evidence.
SmallRig · Part 5921
SmallRig lists charger 5921 for batteries used by Action 3, 4, 5 Pro, and 6.
Safety qualification: exact tier-1/2 manufacturer or certification evidence is linked, with no active conflicting evidence.
Open the evidence, limitations, and model identity for a single accessory.