Third-party batteries for the Fujifilm X-T4 are coming pretty quickly with the first DIGIeye NP-W235 now becoming unavailable, which was followed by the Wasabi NP-W235 that you can still order. Now Green Extreme has a battery exclusively available at Adorama, but there are no details or photos available yet.
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Fujifilm X-T4: B&H Photo / Amazon / Adorama
VG-XT4 Vertical Battery Grip: B&H Photo / Amazon / Adorama
NP-W235 Battery: B&H Photo / Amazon / Adorama
Fujifilm BC-W235 Dual Battery Charger: B&H Photo / Amazon / Adorama