Reddit reviews Bestshoot NPF Battery Charger Battery Adapter for Video Light On-Camera External Monitor Sony NP-F550,NP-F750,NP-F960,NP-FF970, NP-FM50,NP-FM70,NP-FM90,QM71D,91D, NP-F500H/F55H
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NP-F970 quick charger work for Sony NP-FM500H/NP-F550/NP-F750/NP-F960/NP-F970/NP-QM51/NP-QM71/NP-QM91 Battery. They are completely compatible with these batteries. Input: AC100V-240V, Output: DC8.4V 600mA.
Just get the 2-pin power connector that BM is selling and solder it to a 12V NP-F battery plate. It's the cheapest solution.
Link to the connector, scroll to the very bottom.
Battery plate
Battery
Charger.